Hi, I have an Asus Rog Strix Advantage Edition Ryzen 9 5900HX + RX6800m laptop, I heard that some time ago people found a way to flash 6600xt vbios on a 6600m, so this was possible on that model, now, a colleague informs me that the 6800m and 6850m xt chips They are actually the exact same chip, and share the same features, so it would be possible to flash a 6850m xt rom on a rx 6800m, so it seems that Dell has a laptop with the same features.Adantage Edition Specifications, Is it possible to create a bios or rather adapt the 6850m xt bios to the 6800m? I have the dell bios with the necessary modifications made, according to my colleague, There is just one detail, we cannot figure out how to modify the value Subsystem ID For it to match and the bios can be flashed, I will attach both 6800m bios files in their latest available original bios in .bin format And the 6850m xt vbios in question in case anyone with knowledge wants to take a look I recently bricked my laptop and couldn’t get it back, I had to order a spi programmer and flash it myself, After several days I got it yesterday, I mention this so that you are aware that there is a method to flash the BIOS bypassing the read-only lock, and that it is proven that the method works. Although you probably already know this, thanks for the interest, it would be great to be able to flash this bios that would help to have more power And unlock powerplaytables so we can have power control on our amd boards again!!! In addition to increasing overall power, So here I attach the bios, greetings!
Edit: I tried attaching but I can’t seem to do it from a cell phone! If anyone is interested in taking this adventure, let me know!! 
Edit: 2 I uploaded the files to my Drive Attached link
https://drive.google.com/drive/folders/1bBW07K_bfTNN9d6ku9XAlKDmcrE4X9Eu
how do the laptops manage vbios, in the main SPI chip or dedicated chip? Subsystem ID might not be needed to modify, have you tried without it? possibly, system BIOS overwrites the given value with the predefined one
02 10 DF 73 is specified 3x times in your vbios backup, assuming these files are dumped straight from the laptop ICs and it has a separate IC for main bios and AMD vBios.
Thanks for your interest, this laptop manages BIOS and vBIOS on different chips, in case that’s what you were referring to. I don’t have much experience so I haven’t tried flashing vbios just the bios and it took me a while to figure out how to do it but I think flashing vbios is a bit more complicated, previously I flashed vbios but with an original asus vbios I didn’t have spi flasher so I used admvnflash in linux To flash stock vbios It would be great to achieve 6850m xt performance in 6800m In addition to that it will help to unlock ppt in adrenaline, since we do not have options for tuning
If you dont have much experiemce, stay put… you’re not going to be successful editing the PCIr ID and use any regular or software apps to flash a modified file, AMI or ASUS security will block it or will get a bricked laptop, for experienced users who know how to recover, they will try to manually program the IC but there may be references in the main bios code, like a black list, to GPU model used in this base model motherboard.
it will unlock tuning in adrenaline only if it is unlocked on another laptop that you’re taking vbios from
use spi flasher and make backup before flashing
chances are there is no need to edit PCI bits
I didn’t know that I could get on a blacklist, I suppose that with a spi programmer I could recover by flashing the original .rom, although I don’t know exactly what the correct procedure would be.
I took the current dump “RX6800M” from gpuz, does it differ from a dump with spi flasher?
6850m xt has all features unlocked that’s why me and a community are interested in looking into this
i have no idea. best to grab a dump with flasher and compare the two. just noticed the other spi chip in your photo, what is written on these chips?
The left chip contains the system bios and the right chip contains vBIos 6800m
you have clips for both chips, or that is the problem with vbios chip?
I have 2, one for bios and one for vbios, since the bios chip has nowhere to hold the clip, I had to get another one and the programmer comes with the usual clamp clip, in addition to the programmer we had to get a voltage converter to 1.8v and solder a resistor between pins 1 and 8 to be able to bypass write protection on the bios chip @karmic_koala
Now that I have the programmer I am thinking about what was mentioned before, flashing 6850m on my 6800m I am not sure but I believe 90% that it can be successful
i don’t think that is write protection, have you tried desoldering chip and reading it outside the board?
on my laptop i could not detect EC chip, but after desoldering ch341a worked fine with it. it’s just board design preventing access. write protection is usually on another pin
That’s right, bios did not allow writing to it, since some of the redundant circuits activate the write protection, then I discovered in another forum that this protection is bypassed by soldering a 10 ohm resistor which allows writing, that’s how I was able to flash the original bios and recover my pc that didn’t work, I didn’t have to desolder the chip
I have seen that they did the same with the 6600m drivers, they flashed the 6600xt bios and it worked, there are videos on yt
did you check VRAM manufacturers on both laptops? if they have different ones and the vbios you want to flash don’t support your VRAM i guess it won’t work