This has been knwon for quite a while, it occures on all recently released official MSFT ISOs and ESDs. When updating an ISO using W10UI (or the above suggestion) this is fixed.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Code: ============================================================ ESD Contents Info ============================================================ Arch: x64 Language: DE-DE Version: 10.0.26200.9457 Branch: 25H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Education OS 2: Windows 11 Education N OS 3: Windows 11 Enterprise OS 4: Windows 11 Enterprise N OS 5: Windows 11 Pro OS 6: Windows 11 Pro N Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1256 MiB of 1256 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 118 MiB of 118 MiB (100%) done ============================================================ Creating install.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 14 GiB of 14 GiB (100%) done Using LZX compression with 16 threads Archiving file data: 236 MiB of 236 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 163 MiB of 163 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 128 MiB of 128 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 178 MiB of 178 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 161 MiB of 161 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 100 directories) Scanning source tree complete (1070 files in 106 directories) Computing directory information complete Image file is 8714584064 bytes (before optimization) Writing 1070 files in 106 directories to 26200.9457.260913-0436.25H2_GE_RELEASE_SVC_REFRESH_CLIENTBUSINESS_VOL_X64FRE_DE-DE.ISO 100% complete Storage optimization saved 66 files, 18558976 bytes (1% of image) After optimization, image file is 8698560512 bytes Space saved because of embedding, sparseness or optimization = 18558976 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: EN-GB Version: 10.0.26200.9457 Branch: 25H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Enterprise OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1322 MiB of 1322 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 113 MiB of 113 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 14 GiB of 14 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 165 MiB of 165 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 99 directories) Scanning source tree complete (1056 files in 105 directories) Computing directory information complete Image file is 6774128640 bytes (before optimization) Writing 1056 files in 105 directories to 26200.9457.260913-0448.25H2_GE_RELEASE_SVC_REFRESH_CLIENTBUSINESS_VOL_A64FRE_EN-GB.ISO 100% complete Storage optimization saved 66 files, 18499584 bytes (1% of image) After optimization, image file is 6758117376 bytes Space saved because of embedding, sparseness or optimization = 18499584 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: x64 Language: NB-NO Version: 10.0.26200.9457 Branch: 25H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Home N OS 3: Windows 11 Education OS 4: Windows 11 Education N OS 5: Windows 11 Pro OS 6: Windows 11 Pro N Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1232 MiB of 1232 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 117 MiB of 117 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 13 GiB of 13 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 239 MiB of 239 MiB (100%) done Using LZMS compression with 1 thread Archiving file data: 936 MiB of 936 MiB (100%) done Using LZMS compression with 1 thread Archiving file data: 228 MiB of 228 MiB (100%) done Using LZMS compression with 1 thread Archiving file data: 168 MiB of 168 MiB (100%) done Using LZMS compression with 1 thread Archiving file data: 174 MiB of 174 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 100 directories) Scanning source tree complete (1069 files in 106 directories) Computing directory information complete Image file is 6817841152 bytes (before optimization) Writing 1069 files in 106 directories to 26200.9457.260913-0454.25H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_X64FRE_NB-NO.ISO 100% complete Storage optimization saved 66 files, 18487296 bytes (1% of image) After optimization, image file is 6801872896 bytes Space saved because of embedding, sparseness or optimization = 18487296 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: ZH-TW Version: 10.0.26200.9457 Branch: 25H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1412 MiB of 1412 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 114 MiB of 114 MiB (100%) done ============================================================ Creating install.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 14 GiB of 14 GiB (100%) done Using LZX compression with 16 threads Archiving file data: 815 MiB of 815 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 102 directories) Scanning source tree complete (1055 files in 105 directories) Computing directory information complete Image file is 8633909248 bytes (before optimization) Writing 1055 files in 105 directories to 26200.9457.260913-0456.25H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_A64FRE_ZH-TW.ISO 100% complete Storage optimization saved 66 files, 18272256 bytes (1% of image) After optimization, image file is 8618141696 bytes Space saved because of embedding, sparseness or optimization = 18272256 Done. Finished. Press 0 or q to exit.
products 26300 "amd64" $true ced0375d-35a9-4749-9f97-cd64f52245b2 Friday, September 18, 2026 18:57:19 [Internal Corpnet Required] 2026-09 Products.cab Update for Windows 11, version 26H2 (KB5129277) @abbodi1406 To what base URL do I need to append ced0375d-35a9-4749-9f97-cd64f52245b2 to download this products.cab ?
Corpnet is the name for MS's corporate network. Those builds are for internal testing only. It's common for MS to ask employees to "dogfood" builds as it gets closer to official release time.
^^^^^^^^^^^^^^^^^^^^ Code: ============================================================ ESD Contents Info ============================================================ Arch: x64 Language: KO-KR Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Education OS 2: Windows 11 Enterprise OS 3: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1279 MiB of 1279 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 119 MiB of 119 MiB (100%) done ============================================================ Creating install.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 13 GiB of 13 GiB (100%) done Using LZX compression with 16 threads Archiving file data: 156 MiB of 156 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 189 MiB of 189 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 99 directories) Scanning source tree complete (1070 files in 105 directories) Computing directory information complete Image file is 8513585152 bytes (before optimization) Writing 1070 files in 105 directories to 26300.9457.260913-2031.26H2_GE_RELEASE_SVC_REFRESH_CLIENTBUSINESS_VOL_X64FRE_KO-KR.ISO 100% complete Storage optimization saved 66 files, 18296832 bytes (1% of image) After optimization, image file is 8497799168 bytes Space saved because of embedding, sparseness or optimization = 18296832 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: EL-GR Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1326 MiB of 1326 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 115 MiB of 115 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 13 GiB of 13 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 815 MiB of 815 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 98 directories) Scanning source tree complete (1055 files in 104 directories) Computing directory information complete Image file is 6744932352 bytes (before optimization) Writing 1055 files in 104 directories to 26300.9457.260913-2010.26H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_A64FRE_EL-GR.ISO 100% complete Storage optimization saved 66 files, 18591744 bytes (1% of image) After optimization, image file is 6728847360 bytes Space saved because of embedding, sparseness or optimization = 18591744 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: x64 Language: EN-GB Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Home N OS 3: Windows 11 Home Single Language OS 4: Windows 11 Education OS 5: Windows 11 Education N OS 6: Windows 11 Pro OS 7: Windows 11 Pro N Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1240 MiB of 1240 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 117 MiB of 117 MiB (100%) done ============================================================ Creating install.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 13 GiB of 13 GiB (100%) done Using LZX compression with 16 threads Archiving file data: 251 MiB of 251 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 161 MiB of 161 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 950 MiB of 950 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 225 MiB of 225 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 166 MiB of 166 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 161 MiB of 161 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 99 directories) Scanning source tree complete (1069 files in 105 directories) Computing directory information complete Image file is 8797061120 bytes (before optimization) Writing 1069 files in 105 directories to 26300.9457.260913-2035.26H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_X64FRE_EN-GB.ISO 100% complete Storage optimization saved 66 files, 18466816 bytes (1% of image) After optimization, image file is 8781107200 bytes Space saved because of embedding, sparseness or optimization = 18466816 Done. Finished. Press 0 or q to exit.
I grabbed an iso from rg-adguard, MD5: 84267c5e76778a9f545b4106ecac12e1 are those safe to use right now or better wait to 26H2 release? edited to include the rest of the post, I'm on mobile sorry. edit²: replaced CRC with MD5.
MSFT uses SHA256, and the ISOs are not the same as the ESDs. Use whatever you have, there will only be new LCUs in the future, as it is for several years now when staying on the same base build (26100 in this case)..
Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: EN-US Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Home Single Language OS 3: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1311 MiB of 1311 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 112 MiB of 112 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 14 GiB of 14 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 141 MiB of 141 MiB (100%) done Using LZMS compression with 1 thread Archiving file data: 800 MiB of 800 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (500 files in 51 directories) Scanning source tree complete (967 files in 96 directories) Computing directory information complete Image file is 6843760640 bytes (before optimization) Writing 967 files in 96 directories to 26300.9457.260913-2006.26H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_A64FRE_EN-US.ISO 100% complete Storage optimization saved 26 files, 17465344 bytes (1% of image) After optimization, image file is 6828515328 bytes Space saved because of embedding, sparseness or optimization = 17465344 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: EL-GR Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1326 MiB of 1326 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 115 MiB of 115 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 13 GiB of 13 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 815 MiB of 815 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 98 directories) Scanning source tree complete (1055 files in 104 directories) Computing directory information complete Image file is 6744932352 bytes (before optimization) Writing 1055 files in 104 directories to 26300.9457.260913-2010.26H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_A64FRE_EL-GR.ISO 100% complete Storage optimization saved 66 files, 18591744 bytes (1% of image) After optimization, image file is 6728847360 bytes Space saved because of embedding, sparseness or optimization = 18591744 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: EN-US Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Enterprise OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1311 MiB of 1311 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 112 MiB of 112 MiB (100%) done ============================================================ Creating install.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 14 GiB of 14 GiB (100%) done Using LZX compression with 16 threads Archiving file data: 163 MiB of 163 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (500 files in 51 directories) Scanning source tree complete (968 files in 96 directories) Computing directory information complete Image file is 8328773632 bytes (before optimization) Writing 968 files in 96 directories to 26300.9457.260913-2001.26H2_GE_RELEASE_SVC_REFRESH_CLIENTBUSINESS_VOL_A64FRE_EN-US.ISO 100% complete Storage optimization saved 26 files, 17465344 bytes (1% of image) After optimization, image file is 8313530368 bytes Space saved because of embedding, sparseness or optimization = 17465344 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: NL-NL Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Enterprise OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Checking ESD Info . . . ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1315 MiB of 1315 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 113 MiB of 113 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 14 GiB of 14 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 170 MiB of 170 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 98 directories) Scanning source tree complete (1056 files in 104 directories) Computing directory information complete Image file is 6674939904 bytes (before optimization) Writing 1056 files in 104 directories to 26300.9457.260913-2015.26H2_GE_RELEASE_SVC_REFRESH_CLIENTBUSINESS_VOL_A64FRE_NL-NL.ISO 100% complete Storage optimization saved 66 files, 18554880 bytes (1% of image) After optimization, image file is 6658873344 bytes Space saved because of embedding, sparseness or optimization = 18554880 Done. Finished. Press 0 or q to exit. Code: ============================================================ ESD Contents Info ============================================================ Arch: arm64 Language: DE-DE Version: 10.0.26300.9457 Branch: 26H2_GE_RELEASE_SVC_REFRESH OS 1: Windows 11 Home OS 2: Windows 11 Pro Press any key to continue... Code: ============================================================ Running ESD -> ISO v67t ============================================================ ============================================================ Creating Setup Media Layout . . . ============================================================ ============================================================ Creating boot.wim . . . ============================================================ Using LZX compression with 16 threads Archiving file data: 1338 MiB of 1338 MiB (100%) done Using LZX compression with 16 threads Archiving file data: 113 MiB of 113 MiB (100%) done ============================================================ Creating install.esd . . . ============================================================ Using LZMS compression with 1 thread Archiving file data: 14 GiB of 14 GiB (100%) done Using LZMS compression with 1 thread Archiving file data: 822 MiB of 822 MiB (100%) done ============================================================ Creating ISO . . . ============================================================ OSCDIMG 2.56 CD-ROM and DVD-ROM Premastering Utility Copyright (C) Microsoft, 1993-2012. All rights reserved. Licensed only for producing Microsoft authorized content. Scanning source tree (1000 files in 98 directories) Scanning source tree complete (1055 files in 104 directories) Computing directory information complete Image file is 6894583808 bytes (before optimization) Writing 1055 files in 104 directories to 26300.9457.260913-2005.26H2_GE_RELEASE_SVC_REFRESH_CLIENTCONSUMER_OEMRET_A64FRE_DE-DE.ISO 100% complete Storage optimization saved 66 files, 18591744 bytes (1% of image) After optimization, image file is 6878500864 bytes Space saved because of embedding, sparseness or optimization = 18591744 Done. Finished. Press 0 or q to exit. No Education and no N editions for arm64?