I have a Nexus 5. It has TWRP as the custom recovery and on official Android 4.4.4 KTU84P build.
I just received a notification that I'm able to update to Android 5.0 now via OTA. I'm aware that I'll have to re-root my device. But, is it safe to update it with its current state? I already did a Nandroid backup hours ago, BTW. What else needs to be done pre and post-update? Thanks.
UPDATE: I backed up all my files then did another Nandroid back up. I downloaded the update via OTA and was asked to restart my phone. But it went straight to TWRP, doing nothing.
So I restarted my system via TWRP. It's still on 4.4.4 and the Lollipop update does not show anymore. What happened there?