Changing boot logo.

I found THIS LINK, but YMMV and do at your own risk.


Hex editor - He used WinHex
Image editor - Such as PhotoShop
Phoenixtools - Recommends latest version, he used 2.02
Stock Instant Flash firmware - He thinks that any would work but he used the ASRock z77 Extreme 4 Gen4

Create the desired image file:

a. Using your image editor, create a 1024x768 file and save it as a 24-bit color depth JPG file. This file must not exceed a file size of 153 kilobytes for BIOS versions 2.00 (and older?) or 33 kilobytes for 2.10 and 2.20 (probably newer versions too).
b. Now we need to extract the first 4 bits out of a stock image file and replace them on our custom JPG file, all this using your hex editor.
1. Extract Phoenixtool to an easy-to-access folder and run Phoenixtool, load your stock BIOS, don't select SLICS or anything else since we only need to leave it running on the background.
2. Open the folder where you extracted Phoenixtool and locate the DUMP file (folder?) and locate a file named:
BIOS VERSION Filename
2.00 or older 7BB28B99-61BB-11D5-9A5D-0090273FC14D_0_740.ROM
2.10 7BB28B99-61BB-11D5-9A5D-0090273FC14D_0_731.ROM
2.20
2.70 7BB28B99-61BB-11D5-9A5D-0090273FC14D_0_728.ROM
7BB28B99-61BB-11D5-9A5D-0090273FC14D_0_729.ROM
Z68 (?.??) src 7BB28B99-61BB-11D5-9A5D-0090273FC14D_0_614.ROM
Note: On versions 2.10 and newer there are two logo files, which one is the splashscreen that we want to replace and the other one is a smaller logo (similar to the 90s EPA logo on old built computers?), I assume that it's shown elsewhere. The only difference on these smaller logos is its dimensions and size, 264x128 and a maximum file size of 15 kilobytes. The name of these files:
BIOS VERSION Filename of smaller logo file
2.10 C6AD9672-905C-453D-9D4E-A3E9733CB0B9_0_739.ROM
2.20
2.70 C6AD9672-905C-453D-9D4E-A3E9733CB0B9_0_736.ROM
C6AD9672-905C-453D-9D4E-A3E9733CB0B9_0_737.ROM
3. Load your hex editor and open your custom splashscreen file (created on A) and the stock one (from step 2). Like this. imgur mirror
4. Select the first 4 bits of the stock image and replace insert the 4 digits at the beginning of your custom splashscreen file. Like this. imgur mirror
5. Save your custom file as your corresponding stock BIOS filename (according to step 2)
Now proceed to create a custom BIOS firmware

c. Now go back to the running Phoenixtools and choose "ASRock" under the manufacturer field, this will activate the 'Advanced Options' screen.
Under 'Control Options' set the 'Allow user to modify other modules' checkmark and leave by pressing the 'Done' button. Like this. Imgur mirror
d. (On this step he mentions that he did insert a new SLIC and the new module I don't know if this is an optional step but most likely it is) We select the SLIC and SLP file of our choice and click on the 'Go' button, now the program will let you know that 'You can now make manual alterations to any module in the DUMP directory" but do not press that button, just leave it unattended. Like this. Imgur mirror
e. Copy your custom splash screen (the one you saved on step 5) and replace that on Phoenixtool's DUMP folder, it should ask if you want to overwrite it which of course this is what we want.
f. Go back to the "You can now make manual alterations to any module in the DUMP directory" Phoenixtool's dialog box and press the OK button.
Now if this all worked, hopefully it should create a file that you can flash. He does not mention how to do so since he assumes you already know that. If you don't know how to he advises you to consult your owner's manual or user forums.