@Fernando, nothing is impossible with enough resources and dedication, and it's definitely possible to use a modified firmware on that HP machines, but their security measures makes this *extremely* hard for normal users.
HP uses SureStart technology that is robust enough to be unbreakable by hobbyists, IMO. It's not about "hidden checksums", it's EC that does signature verification, a strong chain-of-trust and dynamic instrumentation of the firmware done each 15 minutes. More information on SureStart can be found in this white paper: http://www8.hp.com/h20195/v2/GetPDF.aspx/4AA7-2197ENW.pdf
Breaking it would be a major hit to platform security, and if somebody clever enough can do it, it's better to be reported to HP to be fixed ASAP.

@CodeRush - I need to know the hard way around SureStart, it's a pain in my rear! Programmer in hand does not even help, even when both roms are programmed at the same time = auto-recovery
What type of chip is the EC on, and can it be simply/fully wiped and system still function? What about if removing one flash rom + wiping that EC, leaving only main BIOS rom?

In Windows 7 64 bit I got the message


After executing the command:

AFUDOS.exe modified.rom /P /B /K
 
 

Edit: I followed the guide linked below and was able to bypass Asus modify protection, by using Afuwin64 to update with an official bios .CAP file, and then update with modified .Rom file
https://linustechtips.com/main/topic/592...r-motherboards/

@ViliusK - this is a .capsule type BIOS, not .rom, so best to loose that file extension and rename back to original extension .205
If the file will not flash due to security issues, here is actual .rom format BIOS to use with my guide linked below, however I suggest you redo the mod on a BIOS region backup instead - http://s000.tinyupload.com/index.php?fil...870857352833721
[GUIDE] Grub Fix Intel FPT Error 368 - BIOS Lock Asus/Other Mod BIOS Flash

Using the above guide, you can start at step #6, because I've gathered the variables you need for you below (Also, rename boot64.efi file to Shellx64.efi for your system)
SMI Lock >> 0xAD
BIOS Lock >> 0xAE

Both of those variables ^^ you need to set to 0x0, so at grub prompt you will type the following one at a time, then reboot to windows and flash BIOS using FPT
Setup_Var 0xAD 0x0
Setup_Var 0xAE 0x0

Please note the warning in Red on the guide and redo your mod on a FPT backup of your BIOS region instead of the file you attached above.
And aside from that warning, you cannot use this .cap type BIOS with FPT anyway, the BIOS body would need removed from the capsule first (As you see with the file I linked above from your original mod = 2kb smaller).

In order to use the above guides flashing method you will need to find your Intel ME version using HWInfo64 (In large window, on left side, motherboard section), or see if it's shown in BIOS Main page.
Then download the same version Intel ME Tools Package from this thread, inside you will find the Flash Programming Tool folder that contains FPTw.exe in section C.2
Intel Management Engine: Drivers, Firmware & System Tools

Lost_N_BIOS, You were right, I was unable to flash bios file by ez flash or afudos.
ez flash my bios version is too old.
afudos gives me this: firtsly I tried with /GAN, but received error. Then I tried only afudos N751JKAS.ROM command, and it stuck forever, did not worked even alt+ctrl+del.

IMAGE

Will try this method you described previously, but I have not so much chances because of inexperience and lack of knowledge.

I'm still struggling with my asus N751JK laptop. Still trying to flash it via AFUDOS.

Now I came to this: bios flash starts, "file reading" stage goes to 100% and I get an error in afudos saying "ROM file size does not match existing BIOS size."
Is there a way to fix this ?
Tried using both files for inserting.
Also I managed to downgrade my bios version, hoping it would help for modded bios to flash, but it didn't

@ViliusK - since you are still trying AFU flashing methods, did you try the method posted in post #169 above?

I do not like using AFU, so am not familiar with how to get around it's issues, but a sizing one doesn't sound safe, stop there!
To figure that out possibly, dump your BIOS with AFU and compare with the one you are trying to flash, if the one you are trying to flash is 2KB larger, then it's still in capsule and you need to do as I described in post #170, or use the file I provided.

My suggestion is to stop trying to use AFU and do the method I outlined, you'd be done by now

Hi,
Already flashed with AFUDOS, everything is OK so far, NVMe works.

The reflash method outlined at the end of this guide has been helpful for many who have issues using regular methods with AFU
https://linustechtips.com/main/topic/592...r-motherboards/

CodeRush

Hi, I have a problem with my G771JW. Wpisuje komede afudos namebios.rom / P / B / K and nothing happens - hangs up. In bios, I turned off the boot protection.
Can you help me with this? Please

ViliusK

hi, how did you get the same message about too big file?

@kosi_ / P / B / K will not work, if that is exactly how you are typing them, it should be /P /B /K (No spaces)

If you are getting file is too big messages, stop now and find the cause before you move forward and end up bricking your board.