[REQUEST] Acer Aspire VN7-592G BIOS Unlock

[espionage724]

Alright, so I ordered the clip and set-up a RPi for the programmer and was able to read and write to the chip without issue (read and backed-up my existing BIOS and re-flashed it after a failed flash of the modded one).

As for the modded BIOS itself, the filesize was a problem. I'm using flashrom on Linux and it has a hard requirement that the BIOS file must match the BIOS chip size (6MB modded file vs 8MB chip). I tried a random command to try to write zeros to the remaining space in order to pad it, but the laptop didn't boot (either I messed up while trying to pad it or the modded BIOS wasn't accepted; the padding issue is much more likely).

Is it possible to get the modded BIOS padded to match the exact size of the BIOS chip? The exact size is 8388608 bytes.

Here is the modded BIOS you provided (the previous link is broken): https://drive.google.com/file/d/0B9CekGW...sp=sharing

And here is my original BIOS as-is straight from the chip through Flashrom: https://drive.google.com/file/d/0B9CekGW...sp=sharing

(if you want a different download host, please ask)

Edit: After loading up both files in GHex; the beginnings look totally different. The bottom of both files look somewhat the same though (just different offsets because of what I imagine the different filesizes).

[Da Vinci Code]

Hello!
I have some good news for you.
First, possibly i found way to disable bios rewrite protection (it is set by vendor in bios)
Second, possibly i found way to unlock one hidden tab.
All these tricks we can do without programmer.
Just follow next steps.
1. Take USB stick and format to FAT32
2. Create directory structure EFI\Boot
3. Download BOOTX64.EFI (http://www.mediafire.com/download.php?81vegw2aw0pxcib)
4. Put downloaded file to Boot directory.
5. Restart and enter BIOS setup.
6. Make sure you have following values:
Legacy Support: Disable
Secure Boot: Disable
7. Reboot and press F9 to boot from USB stick
8. Give commands:
setup_var 0x258 0x01
setup_var 0x259 0x00
9. Reboot and check bios setup for new menu.

[espionage724]

I've tried booting from the stick with that EFI file but my laptop just displays a blank screen.

Is this similar to: https://www.bios-mods.com/forum/Thread-R...7#pid90017 ? I've tried that in the past but only got an error stating it was unable to change the EFI variable when trying to change 0x258. It looks like your link provides a different EFI Shell though.

What does 0x259 do? If I recall correctly, 0x258 enables an advanced settings page for Intel settings. In any case, are both variables easy enough to modify from the ROM rip I provided earlier? If those values could be set, I could flash the ROM directly and then have the rewrite protection disabled, and then have a go with flashing the modded BIOS through software means.

Alternatively; if you wouldn't mind modding the modded BIOS to just be padded to the exact size of the flash chip (I'm not certain how difficult that would be), I could just flash it directly and be good to go.

[Da Vinci Code]

Hello!
var 0x259 can disable bios rewrite protection, i think.Bios rewrite protection is vendor limitation but it can be disabled if this option present.
Some mb have this feature but ,if you can see, we'll try to disable it.
Your mod completed and sent in PM!

[espionage724]

Hi, I was able to flash that BIOS successfully to my chip but the laptop didn't POST.

My failed attempt at trying to pad and flash the previous BIOS made the laptop turn on and then immediately turn back off. With the modded BIOS you provided in the PM, the laptop turns on but the screen doesn't turn on and USB devices aren't initialized.

I tried resetting BIOS settings by leaving the motherboard battery out for a little bit, which did seem to cause the laptop to act a little differently (it powered on, powered back off, and then powered back on) but still led to the same result (black screen).

I was able to re-flash my unmodded BIOS again and it POSTS and runs fine.

Did you do both variables in the same mod (258 and 259)? Perhaps one of those are incompatible with my motherboard. If you wouldn't mind, could you perhaps mod two separate BIOS files for each variable (so for one, only enable 258 and then the other BIOS, disable 259) and I could try each one and see if either allow me to POST.

Thank you for all your help so far by the way, I really appreciate it

[espionage724]

Bump

[Da Vinci Code]

New mod completed and sent in PM!Check it!

[espionage724]

New mod completed and sent in PM!Check it!

Hi, thanks for the quick mod, but unfortunately that one didn't seem to work either (same result; laptop doesn't go past black screen).

It seems BIOS recovery through Fn + Esc is still possible though while the laptop was in that state. I tried taking the modded BIOS and renaming it, but it didn't flash through that either.

Was able to restore my backup BIOS again and was good to go (I back it up before trying the modded BIOS each time).

Here's the most recent chip backup I took from my working BIOS; not sure if it'll help or if anything really changes at all but maybe it might help for some kind of comparison: https://drive.google.com/file/d/0B9CekGW...sp=sharing

I'm not sure if there's some kind of security check or perhaps if you have any other ideas, but maybe something to try is to mod the BIOS in such a minor way that it shouldn't break anything, and I could see if that works; just to make sure there isn't some kind of hard-check going on or something.

[Da Vinci Code]

I made changes in second chain of bit lock code but it seems bios have internal RSA check like HP.It's very difficult to detect checking module.
One of Legendary modders, Domovan6000 spent 7 months for checking same module in HP laptops.
I have no idea at now, you are first who have this problem.We need some tester to know if Insydeh20 uses new type of security check.

[Da Vinci Code]

We can try last way:
Create list of some needed options with needed values,
after that i'll make it as default so you can use laptop with new settings even bios lock disabled.