@VIVICTUS
Welcome to the HP support community.
I understand that you want to change the BIOS splash screen, I am glad to assist you.
Here are the steps to customize the BIOS logo:
1. Access the Computer Setup utility, and select System Configuration.
2. Select Device Configurations, UEFI Boot Mode, Enabled.
3. Select the custom logo image you want to use, and then use the imaging software to convert the image to a bitmap (.bmp), and modify the image size to 1024 x 768 or smaller, as necessary.
4. In the Hewlett-Packard folder on the HP_TOOLS partition, create a Logo subfolder.
5. Save the image in the \Hewlett-Packard\Logo folder.
6. Rename the image as Hplogo.bmp.
7. Reboot the computer, and press the F10 key to enter Setup.
8. Select System Configuration, and then select Boot Options.
9. Select Custom Logo, and then select Enabled.
10. Save the changes, and exit Setup.
Keep me posted.
If this helps, please mark the public post as an accepted solution so that it benefits several others.
Cheers.
Sandytechy20
I am an HP Employee