Not receiving OTAs after downgrade?

Hey guys. I have the nexus 7 mobile and I recently downgraded to 4.4.4 from 5.0.2 (by manually flashing the original factory image from google). While I don't necessarily want to go back to 5.0.2 right now, I don't get any notifications for new system updates being available OTA. If a new android comes up for my device, how do I know it will appear as OTA? Or did I break this function by downgrading?

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