Hello everyone,
I’m looking to mod the BIOS of my Lenovo 3733 motherboard (Intel B560 chipset, Rocket Lake PCH-H) with an Intel Core i5-11400F and 4x8GB DDR4 3200 MHz (including a different bar). My PC model is Legion T5-26IOB6 Desktop (Lenovo) - Type 90RT. My goal is to enable XMP 1 profile, modify memory voltages, disable bios lock and flahs protection, in short mod my bios without any problem.
I first used GRUB + setup_var to modify the corresponding variables (XMP, voltage, BIOS Lock, flash protection, etc.) - the commands pass, but the effects are non-existent: my RAM remains at 2400 MHz, no voltage modified.
I then dumped my main BIOS (16MB) via CH341A, modified it with AMIBCP (XMP activation + advanced menus), then flashed this modified BIOS. Result: looping restarts with no display. I had to restore an original dump for the PC to restart.
I think that some Intel ME protections are still active, or that there’s a conflict between the BIOS and the ME. It’s also possible that the Lenovo BIOS is badly modified by AMIBCP (or that integrity checks are blocking the boot).
I can provide:
backup_bios 24Mb.rar (bios 16MB + Intel ME 8MB → 24 MB)
16MB.rar (main Bios → 16 MB)
8MB.rar (Intel ME → 8 MB)
I’m looking for a reliable way to modify my BIOS without causing a reboot loop. Any help on the correct use of UEFITool, Intel FIT, or other tools is most welcome. Thanks in advance for your support!
Edit by Fernando: Thread title shortened (special request details are within the start post)
AMIBCP v4/v5 is an old leaked tool witch versions are from the times of Aptio IV and not valid anymore for MOST of modern Aptio V core bios.
Current leaked versions can’t deal with the correct modifications as its needs to deal with other bios modules/guids
The best approach is the UEFI editor not to confuse with UEFITool and none related with Intel FIT (Flash Image Tool) and his purpose.
I just tried the UEFI editor tool and it does exactly the same thing to me as with AMIBCP, my PC starts in a loop…
I think you have to disable Boot Guard, right ? But I don’t know if it’s possible ?
Well… usually this happens when users just “Unlock”/mess with variables they dont know and/or one setting messes with other functions, you should work also, only in an FPT bios region dump with all security disable… we dont even know if this is a bad flash, a bad mod or even how you’re applying the mod file to the system… kind of a “blind” answer when we dont know user actions, his experience, etc…if i make myself clear enough… not saying that its entirely your fault…
One thing is for sure, UEFI editor will deal better with mods on you A25 bios from 2023 than old AMIBCP…
Go for small steps…
How to disable all protections ? because I only disabled a few with GRUB but I don’t even know if the changes were taken into consideration…
Not all can be disable and some areas that are boot guard protected usually when touched…you get what you already know…
Changes by GRUB can be reckecked upon reboot, again with GRUB, not a cold boot as you probably know…
These areas can be seen here in UEFITool colored… as you can see most of bios region is protected and not a good bios for mod results… even worst in OEM branded systems, some users have achieved some small modifications with success…it all depends on your “time” and “persistence”, who knows you may get it after all.
God luck and you should wait for other users POV.
EDIT:
Im sure you understood the part of Boot Guard protected areas…
and no confirmation or denial part seems quite explicit.
so I will never be able to modify anything in the setup because it is a colored part?
like for example the XMP profile 1 option or the BCLK configuration which are both in the setup which are therefore in the colored part I will not be able to modify them?
