I've seen the second error with an older cRIO, too.
I was able to get it to work eventually, but I haven't had time to experiment with variations yet.
Here are some of the things I did:
- Disabled all NIC's but the one Ethernet port I was using for the cRIO
- Did a Safe Mode reformatting (Safe Mode dip switch. reset the cRIO, run Imaging tool, turn Safe Mode switch back off, reset cRIO)
- Followed by a regular Imaging