A while back I wrote an simple step by step guide how you can change the BIOS splash screen of a Wyse. This works with a lot of series, I’ve tested it with the 941GXL, V90 and V90L series.
The way I did this is very global so you have a great chance this will also work with your own computer, but remember I’m not responsible for destroying your BIOS. Let me hear if it works.
The package with all the necessary tools, can be found here.
Due a small problem with WordPress you’ll have to use “save as”.