[DonRotolo]

One of the DIP switches causes the cRio to come up in bootloader ("no app"?) mode (not sure which, read the docs), regardless of how badly the software's been farkled. It'll then accept your program, which I suggest keeping minimalist and burning it into the cRio.

Flick the switch again, reboot, and things should work normally again.

Greg McKaskle from NI showed me that trick at the NJ regional, saved us a bunch of grief.