To start the WRAP board with ZeroShell you have to use the CompactFlash image for this type of device that you can download from http://www.zeroshell.net/eng/download/
The generic compact flash image does not work because the WRAP boards do not support the A20 gate for the keyboard. Notice that you should use a 19200bps serial terminal and not 34800bps one which the default speed for these devices.
Bye
Fulvio