Cannot perform OTA update on encrpyted Nexus 4 I encrypted my phone because of an Exchange policy with my employer. However, to apply the OTA update, I must decrypt. But the encryption option is greyed out at Settings. I tried removing my Mail account, so the Exchange policy could just re-nable the decrypt option, but it doesn't.
Have you tried restarting your phone after you removed the Mail account?

Make sure to also UNCHECK Settings &gt; Security &gt; Device administrators &gt; Email.