OxygenOS 12 closed beta launches for OnePlus 8/8T series - 9to5Google
OnePlus 8T 16,6 cm (6.55") 8 Go 128 Go Double SIM 5G USB Type-C Argent Oxygen OS 4500 mAh 8T, 16,6 cm (6.55"), 8 Go, 128 Go, 48 MP, Oxygen OS, Argent : Amazon.fr: High-Tech
Download] Stable Oxygen OS 12 now rolling out to OnePlus 8 series in Europe with Android 12
OxygenOS 13 - OnePlus (France)
OnePlus' OxygenOS 12 beta isn't looking good...
How to Downgrade OnePlus 8, 8Pro, 8T to Stable Android 11 (Without Losing Data) from Android 12 [Update Europe variants]