Nope...it doesn't work.

I think UEFI is not active in my BIOS. I rename to Shell.efi file and try....and also i try with Shellx64.efi. Same result.





What should i do next ?

Follow the guide, you need to choose "Launch EFI Shell from filesystem device" from exit page of BIOS, and ONLY Shellx64.efi name will work

USB should be formatted to FAT32, if it's failing with USB Initialized as GPT, then make it MBR instead, and if it's MBR and failing, make it GPT instead. I don't think GPT/MBR matters, but it might.

I don't have "Launch EFI Shell from filesystem device" option. In fact i dont see any EFFI or UEFI options in my BIOS.

Show me an image of the exit page of your BIOS

Sorry for late answer (i was at work)

@bubu782001 - Ahh They hide that from you too, how lame!

Here, you will have to use this method - Alt boot to grub when no boot to EFI on exit page - [Help needed] Hidden Advanced menu Bios HP Z1 J52_0274.BIN (2)
Only instead of the names shown there, you use Shellx64.efi, Shell.efi, and bootx64.efi, so all three of those, in each places in folders as shown in that image

I don't think CH341A will work for my BIOS IC, it is Micron 25Q128A (real name N25Q128A).

It is pretty easy to reach BIOS IC, in the bottom there are 13 screws, then open bottom lid and BIOS IC is revealed.

If CH341A will not work for this chip, i will need to buy a programmer (something like minipro 2)

That chip can also be Numonyx or ST (OEM'd) Yes, CH341A will work, stated here ASProgrammer works (And I see exact ID there) - https://www.badcaps.net/forum/showthread.php?t=79025
You do need 1.8V adapter, or get programmer that supports 1.8V by switch. Or replace that chip with a more common compatible 1.8v windbond one.

REVELPROG programmer is compatible, as is 2019+ EZP_XPro V2

If you dump your ME FW I can tell you what other chips are compatible with BIOS by default >> FPTw.exe -me -d me.bin

None of this may be necessary, all you have to do is boot to grub and we can check it out. It IS possible, you just have to sort it out.

There is no pb to take out chip and read it. I just ordered TL866 II minipro. It has support for this chip. I also have a hot air station to unsolder and resolder back BIOS chip.

So...it may not be necessary to work physically with BIOS chip? It can be done by boot to grub ? How can i do that ?

OK, then if you are good to go doing this kind of thing, yes, it's not an issue to do that way if you want.

Yes, I've been waiting for you to get in grub already, confirmed working easily on other thread you posted too initially.
Once you get into grub you just need to enter the command I showed you and then SATA 6Gb/s will be enabled. BIOS Mod was never needed here just for that.
How? I showed you above, see post #21. Once in grub, see post #11

* Edit @bubu782001- If you can't get it, keep at it, you will succeed! If not, we can also try this, download this package, leave all files/folder in place always, run the commands shown in text for each version, then send the package back to me as-is
Some, or all may error, some or all may not give us anything, it's OK, just another method we can try is all.
http://s000.tinyupload.com/index.php?fil...320557160579721

I'm interested to unlock SATA selection menu and mod BIOS permanently - not only enter command.

I hope to unlock BIOS from grub...

Yes, but first goal of this thread was to enable SATA 6Gb/s, that is done with simple command I gave you as noted out above.

Once you learn how to get to grub, we can try further method to unlock BIOS Locks that block mod BIOS flashing, to then try and allow flash of mod BIOS (which other user never got into since he had programmer)

I cannot boot into UEFI. In boot menu ai se only PMAP device, not UEFI device.
I copy file bootx64.efi and renamed shell.efi (renamed bootx64.efi) to root, then same files to BOOT folder, then same files under EFI folder (located also in BOOT folder).

So i upload pictures to see. I only see prompt "C:\"

You sure you formatted your USB as UEFI GPT?

With HP format utility? GPT ? How ?