Today OnePlus mobile released a Nougat 7.1.1 based software update for 3 and 3T smartphone users. The latest firmware will update the OxygenOS version to 4.1.3. OnePlus has confirmed this update via forums and also posted changelog for 3/3T mobiles.

As per the release notes OxygenOS 4.1.3 update includes expanded screenshot, reduced blur effects on capturing moving objects, improved video recording stability, enhanced wifi & bluetooth connectivity, solved instagram swiping issue, fix for hardware button malfunction bug, system stability enhancement and other bug fixes.
The company rolling out this software update in batchwise via OTA. So it will take time to reach both oneplus 3 and 3t models. It will not erase your personal files but for safety backup your data to removal storage devices.

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