Chinese variants of OnePlus 5 and 5t having the HydrogenOS (Android Pie) have started receiving the latest December 2019 security patch update.  This is not a major update but it brings many bug fixes to the device. The new update also improves system stability and performance. Many users have been waiting for the Android 10 update. It looks like these devices will be getting the update in the Q2 of 2020. As per our knowledge, we think the next HydrogenOS update for these two devices will be the Android 10 update, but that’s us.

The Global OnePlus 5 and 5T with the OxygenOS haven’t received the December 2019 patch update yet. But after the Chinese variant, we think the Global variant of the OnePlus 5 and 5T will soon be getting the December 2019 security patch update. System

Update Android security patch to 2019.12 Improve system stability and fix known issues

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OnePlus 5   5T H2OS December 2019 Security Update Released but without Android 10 - 46