Sorry, my english teacher was very very poor. I'm translate almost here with an online translator. new joke angle? Have I misunderstood something here? Or you?
The Surface deployment guide should work even for the latest 21H2. boot.wim is what it's intuitively called - the small winpe setup environment / winre recovery environment, when boot-ing from a usb or dvd / entering advanced startup in uefi setup. install.wim is the one you're customizing with the windows setup files that get installed to your device Again, the guide touches both of them, will create a complete distribution media containing both (plus other boot/setup/support files).
Thanks for the tips! "Windows Assessment and Deployment Kit - Windows 10" + "Windows Assessment and Deployment Kit Windows Preinstallation Environment Add-Ons - Windows 10" was installed by the script. But f***... I have Windows Build 19044 I didn't think about that anymore. Ok, I must run it on other PC with W11 or newer 10 Build.
19044 is 21H2 so it should have been fine! Then I guess it's a localization issue? Either way, is worth letting microsoft know about your experience in the github.