6800 Ultra Bios Flash Directions

*DISCLAIMER* This is still a very risky activity. Do not continue if the thought of breaking your computer scares you.

In the interim of finding a way to unlock manual overclocking in the 6800 Ultra bios, you can edit your bios' default core and memory clock speeds as a workaround.

There is a very long thread on how to do this by hand at http://www.notebookforums.com/showthread.php?t=91802.

The process involves making a boot CD and retrieving your bios with NVFLASH and then hex editing the values. It's not overly complex, but it is a little technical, and you should all be greatful to Shoman24v for testing my theories and risking his machine.

Since our initial experiment, which was a success, Cornholio has been making a collection of bioses with popular core/memory clocks to simplify the process which RamIt is hosting.

Now you can benefit from these guys' hard work by using their presets to flash your bios, instead of hex editing yourself.

Here are the simplified steps:

Download this CD image: http://home.comcast.net/~deschampsco...00UBOOTROM.rar
This is a bootable DOS CD that also contains nvflash and all the modded bioses, as well as a copy of the original bios.
Burn this image onto a CD-R (NOT CD-RW) using your favorite burning software.

Reboot. Press F12 to enter your selective boot menu.
Select your CD-ROM drive.
Select the first mode (highest compatability).
Press enter when you are prompted about your CD drive.
Wait for the 'R:\' prompt.
Type 'nvflash -c'. This will verify that nvflash can write to your eeprom.
Type 'nvflash [name of bios to use]'. This will flash your bios. Do not forget the .rom file extension of the name.
Reboot.

That's it. Easy peasy lemon squeezy.

If for some reason you cannot boot from your CD, you may have to make a CD following the instructions from the original post. Unzip the bioses which are hosted by RamIt (see post below) and add them to the same folder you add nvflash to. When you have finished making your CD, return to this post for the rest of the instructions.

Hope this makes it easy on you, the other post was getting a bit long.

What is your email again?

By the way, here is a quick tutorial on how to pass the checksum, which is the hardest part of the hex editing process.

1. Open up windows calculator in scientific mode.
2. Do the checksum-16. Note your result.
3. Set calc to hex, enter checksum result. Set calc to decimal. Note converted value of checksum. We'll call this 'a'.
4. If 'a' is greater than 50944, then subtract 50944 from 'a'. If 'a' is less than 50944, then subract 'a' from 50944. This is our difference 'b'.
5. Set calc to hex. Enter the last block of hex in the file (1 block = 2 hex values = 4 digits. e.g. FFFF). Set calc to decimal. Note converted value of block. We'll call this 'c'.
6. If 'a' was greater than 50944, then subtract 'b' from 'c'. If 'a' was less then 50944, then add 'b' to 'c'. Set calc to hex. This is our final result 'd'.
7. Change last block of hex in file to 'd'.
8. Run checksum-16 again to verify result is now C700.

That's why I need your email

Woops. Yeah, can you add .ROM to the end of that filename?

Oh, and RamIt, can you keep adding to your first post in this thread when you add new links so that info stays at the top?

That way directions and links will all be in the first 2 posts.

Also, someone else is going to have to create the boot CD with all the bioses in the same directory as nvflash and then rip the iso. I'm all out of CD-Rs. All I have left is DL DVD+Rs, and I ain't using those.

This is the part where my disclaimer comes into play.

This is weird. A final block of FF4D generates the proper checksum. So does a final block of B29A. Try the one I'm about to send you that uses the other final block.

If it does, I don't know what to tell you. The reasoning is beyond my knowledge.

Have all the bioses in that zip been confirmed to work?