Initially using the Nexus Root Toolkit, unrooted etc, downloaded the correct file from https://developers.google.com/android/nexus/images, tried to update, and would not write the radio file (waited for ages), tried to do using adb etc, no go.
Finally downloaded the 4.4.2 image, and using fastboot, this successfully did everything up to userdata, erased userdata successfully, and sent file, but never completes writing. (writing 'userdata'...) If I reboot, just gets stuck on the 4 circles.
Have installed CWM and tried doing a factory reset, but can not mount data....
Anyone able to assist?