How to Modify Your HD2900 BIOS Clock Frequencies by Hex File

[ZenEffect]

this topic mostly pertains to abit users, and how when hex editing the bios of our 2900xt's we get no video output. the root of this problem is that the file checksum changes. i.e. a unmodified, true bios file checksum would have 0xD200 (when checked with atiflash -cf filename.bin) after modding it the checksum becomes 0xD201. i took the easy route and changed my clock values with the quantumforce 2000xtbios tool then opened a hex editor. i looked for data that could be expendable (pick below, look to the right and ive changed some text that i will never ever ever see) and changed its values until the checksum
matched the genuine bios. (kept going back and forth between hex editor and atiflash -cf, though there are hex editors that can give checksum) when they did match, i flashed my 2nd card and viola! i get device id info, product name etc... just as if i flashed with a legit bios. so then i flashed my 1st card with the same bios and crossed my fingers then rebooted. I HAVE VIDEO W00T! bios' took and all is running well. hope you guys understand my babbling and pass on the word. here is a sc of what i did in the hex, the top window is the origional and the bottom is modified. look to the right to see what "expendable data" im talking about to get a good checksum some garbage about how you are a noob and you didnt connect the power cables





apparently only abit users need to go this extra step. im sure there is a more elegant solution based on what i did but whatever, it worked for me!

here is the bios, i believe its a 870/990 bios with 1.25 volts 512MB. took the origional from techpowerup BIOS database and is the Hynix 1.1 club3d bios (i made about 50 different ones and im a stoner with no real good labeling system)
at fan locked in at 100% i barely hit 73c with stock hsf



this really really works and wont brick your card

i use an abit ip-35 pro w/ 2 2900pro/xt bios in cf. i tested on 2nd card first to see if i got the blank info or not. blank info = no video for abit