I only have some CAN versions that I have reprogrammed for UART. Then the manufacturer ID and device ID are wrong. When I go back to CAN, I am not able to communicate with the chips (not with the original one eithetr ...) so I can't verify if the XROW becomes good again (or is good originally ...)
Atmel thinks it might be the programmer.
What programmer are you using ? Mine is a HILO systems ALLP2.