Hi,
On this site is a guide for changing the boot screen.
PAK files
A custom PAK file can be created to modify the splash screen files. This will require the Wyse Linux SDK to create the PAK file and may be deployed via FTP without Rapport. The command line steps above, once again, may be used as a guide to create the PAK scripts.
Anyone know where to obtain the SDK kit and if possible give some pointers on using it?