My nexus 10 is rooted and i'm running CWM v188.8.131.52, after trying to install the 4.4 OTA update my tablet was stuck at the 4 swirling circles. I have now wiped all data, cache, etc. after trying to recover, and trying to install the new stock file through adb sideload to no avail. My PC does not see the tablet when in fastboot. So I'm not sure what to do at this point. Any help would be much appreciated.
UPDATE: So, the PC I was trying to recover with was using XP, I switched to my laptop that's Windows 7, and voila, I was able to sideload the stock 4.4 firmware... guessing it was an incompatibility quirk with XP. Anyways, I'm up and running. Maybe this will help someone else.