Hi! I would like to find a way to unlock flashing bios on Steam deck that is based on custom AMD apu. It uses H2O uefi, and secure flash for updates. I did patch tool (h2offt for linux supplied as part of os) to think platform is insecure and it tried to flash stuff, but if i actually changed bytes stuff like:
jupiter_bios_updater/h2offt jupiter-F7A0115-bios-backup_patched.bin -N
Read file successfully. (path=“/root/jupiter_bios_updater/platform.ini”)
Read file successfully. (path=“/root/jupiter_bios_updater/msg_eng.ini”)Insyde H2OFFT (Flash Firmware Tool) Version (SEG) 200.01.00.10 Copyright(c) 2012 - 2020, Insyde Software Corp. All Rights Reserved. Initializing Current BIOS Model name: CHACHANI-VANGOGH New BIOS Model name: CHACHANI-VANGOGH Current BIOS version: F7A0115 New BIOS version: PATCHED[============== ] Updating Block at FFEA8000h (91%)Error: IHISI 14h read compare fail after write. Address: FFEA8000
Error: IHISI 14h read compare fail after write. Address: FFEA8000
Error: IHISI 14h read compare fail after write. Address: FFEA8000
happened.
Here you can find bios dump and tool