Search for: "CPH1933_11_A.43_20220321.ofp" or visit reputable firmware archives like or OPPO Stock ROMs on XDA. Always verify the SHA-1 checksum after download.
If your phone is stuck on the Oppo logo, flashing the stock ROM can repair corrupted system files. oppo cph1933 flash file
Revert from a buggy beta update back to a stable build. Search for: "CPH1933_11_A