This guide is specifically for the Oppo A9 2020 (CPH1937 / CPH1939). Using firmware from a different model will "brick" your phone.
If you want, I can expand this draft into a full how‑to with screenshots, a checklist printable PDF, or a short FAQ targeted to A9 2020 owners. oppo a9 2020 rollback package exclusive
This specific exclusive rollback is for CPH1937, CPH1939, CPH1941 running ColorOS 11 (C.07 to C.10) . This guide is specifically for the Oppo A9