If you have custom recovery, put a rom and gapps if necessary on a microsd card, finish wiping with a factory reset, cache and dalvik wipe in custom recovery, and flash the rom. You'll lose everything, but it should work again.
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Current Devices: Nexus 5, Asus TF700, Google Glass, (2013) LTE Nexus 7, Logitech Revue, Chromecast
Retired: Samsung Fascinate, Droid Charge, Galaxy Nexus, (2012) WiFi Nexus 7, Nexus 4