Using aboot dumped from an unlocked device (CN variant):

If your phone is stuck on the OPPO logo, a fresh firmware flash can often fix the corrupted system partition.

OPPO implements a strict Anti-Rollback mechanism on devices running Android 8.1 Oreo and later.

: Qualcomm Snapdragon 660 (MSM8976 Plus) Octa-core 2.2 GHz. RAM/Storage : 6GB LPDDR4X RAM with 128GB internal storage.