This WiShield library is developed by Async Labs. About four years ago(2009), Async Labs stop updating WiShield.
- Support Arduino 1.0.1 IDE and after.
- Support Arduion Mega and Arduino 2560.
The firmware MRF24WB0MB(Produced after about 2012.06) seems to be updated, now the WiShield couldn't work with it.