OnePlus 5 and OnePlus 5T have received new OxygenOS update through stable channel with May 2018 security patch and several improvements. The OxygenOS 5.1.2 stable update fixes auto-rotation stability issues, Wi-Fi connecting issue, brings double-tap to lock screen, and more. The incremental OTA update starts rolling out and all users will get it soon on their device.
Before start installing the new OxygenOS 5.1.2 OTA update on your OnePlus 5 or OnePlus 5T, keep in mind that this is the full ROM update and weighs around 1.6GB, so make sure you download the update over a good Wi-Fi or 4G network connection. You can also download and install the new update manually as given below.
OxygenOS 5.1.2 Changelog:
Updated Android security patch to May 2018
Fixed auto-rotation stability issue
Places – A map view of photos by location
Recently Deleted collection for Gallery app
Fixed Wi-Fi connecting issue
Double-tap to lock screen
Fixed microphone not functioning issue for AKG earphones
Recently, OnePlus rolled out new software update (OxygenOS 5.0.3) for Oneplus 3 and OnePlus 3T and their newly launched OnePlus 6 (OxygenOS 5.1.5) with various improvements and May security patch.
If you prefer to install latest OxygenOS update manually on your OnePlus 5 or OnePlus 5T, then you can download and install the full ROM.
You can download OxygenOS 5.1.2 from OnePlus download section here or directly from here for OnePlus 5 and here for OnePlus 5T. To install the update on your device, follow this guide. (Source)