OxygenOS 9.0.2 based on Android PIE for OnePlus 3 & OnePlus 3T
OnePlus 3 Firmware Flash File (Stock ROM Installation Guide)
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.
OnePlus Nord N100 Firmware Flash File | Stock ROM Guide
Install OnePlus 3T official Oxygen OS 3.5.3 and later [Download stock firmware & OTA]