OnePlus 5 vs. OnePlus 3: Should you upgrade? | Android Central
How to Upgrade the OnePlus 3 & 3T Modem Firmware to 9.0.2? - KrispiTech
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 smartphones will get Android firmware updates from two to four times
OxygenOS 9.0.6 for OnePlus 3 and 3T is rolling out : r/oneplus
SultanXDA Explains Unified ROM Approach on the OnePlus 3/3T