The same thing happens - it is stuck in the Clockwork Mod Recovery update loop. I can't get it to do anything else.
So if you try to boot normally or try to boot with X you cannot get to the CW recovery screen?
If this is true you might need a PC to fix. If you can get to the recovery screen you can try wiping Data/Cache and rebooting or try flashing UD again.
I can't get it to do anything else no matter what I try. It acts like it is installing an update.zip but it gets about a 1/3 of the way through and starts again. Over and over and over...
If all it does is bootloop no matter what you do then RSD might be your only option