I have a rooted GSM nexus and I used galaxy nexus toolkit to root it a few months ago. I tried to flash a new rom this morning and I made sure I wiped data and dalvik, also made a back up before I started. So far I have tried to restore the back up (that did not work) and now I am trying to use odin but I keep getting a Odin3 Communicator has stopped working error. I'd also like to say that I have no experience with adb.