[REQUEST] HP Notebook 14-dq1037wm

[GRASS_BUSH]

[attachment=22623]I modified my BIOS and flashed successfully using CH341A but when the notebook turns on the bios it gives a corrupt error because of crc32, would anyone know how to remove this module or skip it in attachment to my BIOS dump

[Sml6397]

Hello,

I love your initiative in modding your own BIOS! Without a screenshot of the entire screen with the error, it is difficult to say what exactly is going on, but I would imagine that this is due to the NVRAM needing to be cleared after the flash.

Open up your computer, remove the CMOS/BIOS battery and the AC power adapter and the laptop battery, hold the power button for 20 seconds, and then after 15 minutes put/plug everything back in.

When you turn on your computer again, it might restart itself a few times or you may have to restart it 2 or 3 times yourself. If the NVRAM inconsistency was the issue, your system should now be good to go.

~Steven

[Sml6397]

Upon further research, your notebook's BIOS uses RSA Encryption. UEFITool can take care of this for notebooks up to around 2015, but notebooks released after that will brick if modded. Essentially, HP "signs" a hash of their BIOS. If a single bit of the BIOS is modified, then the hash calculated from the mod won't match what the BIOS BootBlock expects. Look up digital certificates with hashes for more information.

Did you make a full BIOS backup before flashing your mod using the CH341A? If so, you can simply flash that unmodified dump back and your notebook should boot again. Otherwise, this notebook is hard bricked. You can look up recovery procedures for this notebook, but I don't know if HP has those in place for these models.

[GRASS_BUSH]

i backed up and flashed it back to my notebook and it's working fine. i couldn't find anything about encryption rsa my notebook was manufactured in december 2019 attached is my original bios dump if you can analyze i would be grateful

[Sml6397]

i backed up and flashed it back to my notebook and it's working fine. i couldn't find anything about encryption rsa my notebook was manufactured in december 2019 attached is my original bios dump if you can analyze i would be grateful

The Security Tab within UEFITool shows this data:
S-ACM found at base FA0000h
ModuleType: 0002h ModuleSubtype: 0001h HeaderLength: 00019340h
HeaderVersion: 00030000h ChipsetId: B00Ah Flags: 0000h
ModuleVendor: 8086h Date: 02.10.2019 ModuleSize: 00019340h
EntryPoint: 0000B758h AcmSvn: 0002h Unknown1: 00000000h
Unknown2: 00000000h GdtBase: 00004470h GdtMax: 00000020h
SegSel: 00000008h KeySize: 00000180h Unknown3: 00000340h

ACM RSA Public Key (Exponent: B40F05FAh):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ACM RSA Signature: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------------------------------------------------------------------------

Here, we can see that RSA signatures are in use. In theory, if a single bit is modified in the image, your computer should fail to boot.

That being said, I have never actually tried modding a post-2015 HP notebook myself (due to risk of bricking). If you would like, I could send you a modified BIOS image over PM and you could test it out. It will likely brick your notebook, but you have been able to recover from the backup you took. The BIOS image you posted in your first post is the modified one, right? If so, please upload the unmodified dump you recovered from.

In the likely case that your BIOS is unmoddable, I can give you a list of interesting settings and you can tell me which ones you want to change, and I can show you how to use the bootable RU.EFI utility to manually change hidden BIOS settings. This will very likely be how you must modify settings.

[GRASS_BUSH]

If you can do it, I'm very grateful, I was modifying it to have access to advanced and cpu and gt power management tab
  MYBIOSDumpOriginal.bin (Size: 16 MB / Downloads: 9)

[GRASS_BUSH]

my bios dump from ch341a

[Sml6397]

***WARNING: DO _NOT_ FLASH THIS MOD. IT ALMOST CERTAINLY WILL BRICK YOUR COMPUTER. I REPEAT, DO NOT FLASH THIS UNLESS YOU ARE GRASS_BUSH. GRASS_BUSH has a hardware programmer and a confirmed working backup.***

Hello GRASS_BUSH,

I have completed your BIOS mod. This will almost certainly brick your computer due to the RSA signature on your post-2015 HP notebook. However, you wanted to have a go at it and I was curious too.

I unlocked the Advanced and Chipset Menus via hex edits to the AMITSE module. I used UEFITool v58 NE for extracting the module from your backup and UEFITool v28 for inserting the modified AMITSE module back into the backup.

In the likely case that this __hard bricks__ your laptop, simply flash the backup that worked before back onto it using the hardware programmer. We will use RU.EFI to modify hidden settings in the likely case that a BIOS mod inevitably results in a dead computer.

***WARNING: DO _NOT_ FLASH THIS MOD. IT ALMOST CERTAINLY WILL BRICK YOUR COMPUTER. I REPEAT, DO NOT FLASH THIS UNLESS YOU ARE GRASS_BUSH. GRASS_BUSH has a hardware programmer and a confirmed working backup.***