I've a complaint from my bios boot about the checksum of the bios Prior to flashing it seems to say the checksum is E500 H Ohter bios tools(supplier) claim the bios is 63C1H ==> and marks it as a checksum error Did a simple mod I think fully successfull except for the Checksum and the boot complains I do not know if somehow I can alter the checksum ???? Code: i logged the bios modding :: mod bios Steps original bios 60xM7E.F8b Slic file Xp Asus.bin SLP Asus.txt matching ASUS.xrm method SSV3 (no room) SSV1 GO DLIC performed Successfull Log report: AWARD1.34: Version 1.34 bDynamicForce - False iDynamicMethod - -1 bASUSLock - False bSLICSize - True bManualAddress - False lManualAddress - 0 bOEM7Force - False iOEM7Method - -1 bSSV3Force - False iSSV3Method - -1 bOnlySDT - False bCorrectDSDT - True bOEMIDOnly - True bIgnoreWarnings - False bBeforeUTS - False bCorrectWhole - True bPreserveWhole - False bCorrectModules - True bCorrectSB - True bUseLHA - False bRemoveMC - False bPreserveCPUID - False iCPUID - 0 bAlterDSDT - False Original BIOS size 524288 bytes (512K) 20000 Module 6oxm7e.BIN (5000) Compressed size 84629 Original size 131072 34ABC Module awardext.rom (407F) Compressed size 39227 Original size 58032 3E41F Module CPUCODE.BIN (4001) Compressed size 8974 Original size 14336 40754 Module ACPITBL.BIN (4003) Compressed size 5987 Original size 15134 41EDE Module AwardBmp.bmp (4002) Compressed size 741 Original size 5772 421EB Module G400-15.vga (4080) Compressed size 19632 Original size 32768 46EC2 Module vb815400.dat (4081) Compressed size 22203 Original size 40960 4C5A5 Module ncr307.16k (4086) Compressed size 9582 Original size 16384 4EB39 Module dbios.bmp (4011) Compressed size 1367 Original size 2916 4F0B8 Module i8154m.p9 (4012) Compressed size 9812 Original size 17402 Padding pattern is 211 Module 6oxm7e.BIN has a padding checksum of FFh <<<<<<<<<<<<<<<<<<<<<<<<<<<<< Module and decompression block checksum is valid (EB - Start 20000 Length 4FFFE) Extra checksum valid <<<<<<<<<<<<<<<<<<<<<<<<<<<<< First byte (LSB) checksum is valid <<<<<<<<<<<<<<<<<<<<<<<<<<<<< BIOS image does not sum to 0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<< SLIC module size is 374 bytes SLIC module checksum is 0 OEM Activation 2.0 SLIC RSDT table OEM and Table ID patched to _ASUS_Notebook DSDT table OEM ID patched to _ASUS_ DSDT checksum corrected (C6) <<<<<<<<<<<<<<<<<<<<<<<<<<<<< FACP table OEM ID patched to _ASUS_ ASUS_FLASH SLP 1.0 string added Main Module is 2 bytes too big Zero area 1 Main module is 34 bytes to small Main module is 13 bytes to small Main module is 11 bytes to small Main module is 9 bytes to small Main module is 8 bytes to small Main module is 7 bytes to small Main module is 6 bytes to small Main module is 5 bytes to small Main module is 4 bytes to small Main module is 2 bytes to small Main module is 1 bytes to small Main Module is correct size New BIOS written 524288 bytes Extra checksum valid Corrected BIOS written 524288 bytes 20000 Module 6oxm7e.BIN (5000) Compressed size 84629 Original size 131072 34ABC Module awardext.rom (407F) Compressed size 39227 Original size 58032 3E41F Module CPUCODE.BIN (4001) Compressed size 8974 Original size 14336 40754 Module AwardBmp.bmp (4002) Compressed size 741 Original size 5772 40A61 Module G400-15.vga (4080) Compressed size 19632 Original size 32768 45738 Module vb815400.dat (4081) Compressed size 22203 Original size 40960 4AE1B Module ncr307.16k (4086) Compressed size 9582 Original size 16384 4D3AF Module dbios.bmp (4011) Compressed size 1367 Original size 2916 4D92E Module i8154m.p9 (4012) Compressed size 9812 Original size 17402 4FFA7 Module iSLIC.BIN (4045) Compressed size 374 Original size 374 50142 Module ACPITBL.BIN (4003) Compressed size 6006 Original size 15138 Padding pattern is 211 Module 6oxm7e.BIN has a padding checksum of FFh Module and decompression block checksum is valid (D4 - Start 20000 Length 4FFFE) Extra checksum valid First byte (LSB) checksum is valid Second byte (MSB) checksum is valid BIOS image sums to 0 SLIC performed successfully. BIOS file is G:\DBLSTORE\KITS\COMMONWARE\TOOLS\MODDER\BIOS\ORG\FIRE\6OXM7E_SLIC.F8B Original BIOS size 524288 bytes (512K) 20000 Module 6oxm7e.BIN (5000) Compressed size 84629 Original size 131072 34ABC Module awardext.rom (407F) Compressed size 39227 Original size 58032 3E41F Module CPUCODE.BIN (4001) Compressed size 8974 Original size 14336 40754 Module ACPITBL.BIN (4003) Compressed size 5987 Original size 15134 41EDE Module AwardBmp.bmp (4002) Compressed size 741 Original size 5772 421EB Module G400-15.vga (4080) Compressed size 19632 Original size 32768 46EC2 Module vb815400.dat (4081) Compressed size 22203 Original size 40960 4C5A5 Module ncr307.16k (4086) Compressed size 9582 Original size 16384 4EB39 Module dbios.bmp (4011) Compressed size 1367 Original size 2916 4F0B8 Module i8154m.p9 (4012) Compressed size 9812 Original size 17402 Padding pattern is 211 Module 6oxm7e.BIN may have an invalid checksum (FF) <<<<<<<<<<<<<<<<<<<<<??????????>>>>>>>>>>>>>> Module and decompression block checksum is valid (EB - Start 20000 Length 4FFFE) <<<<<<<<<<<<<<<<<<<<<<<<<<<< Extra checksum valid <<<<<<<<<<<<<<<<<<<<<<<<<<<< First byte (LSB) checksum is valid BIOS image does not sum to 0