Download Oxygen OS 4.0 for OnePlus 3/3T OTA and stock firmware | Stable Android 7.0 Nougat
OnePlus 3T firmware: OxygenOS 5.0.6 available!
How to flash OnePlus 3T System - YouTube
OnePlus 3 and 3T Will Reach Same Update Schedule From Nougat and Beyond
OnePlus 3T Official Firmware Upgrade OnePlus3TOxygen_28_161122 - YouTube
OnePlus 3 Firmware Flash File (Stock ROM Installation Guide)
Download and Install OnePlus 3T Stock Rom (Firmware, Flash File)
Daily Updated] OnePlus 3/3T Stock Firmware and Recovery Collection
GitHub - angela-d/firmware_oneplus: Extract only firmware and radios from the official OxygenOS image for Oneplus 3, 3T, 5 & 5T devices to create flashable zip files for OTA updates on Lineage OS.