Thanks to NexxCat@reddit.
Acquire "AMI ChangeLogo Tool v5.0.0.2" from here.
Acquire the BIOS to modify. I used E7B89AMS.1A3.
Extract and rename the BIOS to E7B89AMS.ROM
Run ChangeLogo_v5.exe
Click "Load Image"
Select E7B89AMS.ROM
Click "Browse" below "Save Logo"
Select your new boot logo, It *must* be JPEG no bigger than 800x600.
Click "Replace Logo"
Under "Available Images" select MyOemLogo1
Repeat steps 7, 8 & 9
Click "Save Image As" and provide the original filename for your modded BIOS. In this case, I used E7B89AMS.1A3
Flash the modded BIOS as you usually would.
Acquire the BIOS to modify. I used E7B89AMS.1A3.
Extract and rename the BIOS to E7B89AMS.ROM
Run ChangeLogo_v5.exe
Click "Load Image"
Select E7B89AMS.ROM
Click "Browse" below "Save Logo"
Select your new boot logo, It *must* be JPEG no bigger than 800x600.
Click "Replace Logo"
Under "Available Images" select MyOemLogo1
Repeat steps 7, 8 & 9
Click "Save Image As" and provide the original filename for your modded BIOS. In this case, I used E7B89AMS.1A3
Flash the modded BIOS as you usually would.