Hi,
I've read through the forums and haven't found a solution. My company just got 7 used R-J3iB cabinets and I'm in charge of inspecting them. I powered two of them on without errors (besides those caused by not connecting them to a robot), but when I went to do a Controller Backup both errored out. One says Device is Protected and the other says Illegal Device Name. Both recognize that there's an MC device plugged in. I'm using a 512MB compact flash disk in a PCMCIA adapter. It still works with our other R-J3iB cabinets so it's not the card. I tried formatting the card at the cabinet, and formatting the disk on my PC as FAT. The new cabinets are V6.23 and the other ones are 6.21 I believe, if that helps.
Update: the readers had broken pins on the board connector. I pulled a working one and the problem disappeared.