OTA update won't install after stock LP ROM installed

[danfinger]

Recently put stock lollipop ROM on my nexus 5, everything seemed fine, I got the OTA update to 5.1.1. Now in the last week I keep getting ‘System update downloaded’ message. I tap ‘RESTART & INSTALL’ and it will sometimes just reboot the phone, and sometimes it goes to the TWRP home screen. I’ve unrooted, that didn’t seem to work. Not sure what else I can do to get this thing installed. Is there a specific folder these updates are stored in? Thinking I could try to side load it… ? out of ideas. Thanks,

 

[SactoKingsFan]

With Lollipop the OTA update won't install if it detects that the system has been mounted read/write. You should be able to install OTA update if you flash stock unrooted firmware.

Sent from my 6045I using Tapatalk

 

[danfinger]

The ROM I flashed was 5.1.1 (LMY48I) from the factory images site.

apologies, I've only changed ROMs a couple of times. I assumed the firmware was bundled with the ROM image. Where does one find stock unrooted firmware? If I flash this, will it wipe my phone?

I'm using 'Nexus root toolkit' - If I just select 'Relock' OEM Lock, will that do the trick? question again is, will that wipe my phone?

Thanks again for your input.

 

[SactoKingsFan]

The phone should be unrooted after flashing the stock factory image from the site. This will restore firmware and wipe data.

Pretty sure OEM lock is for locking the bootloader.

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