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How To Use Secret Codes On Oppo A9 2020 Upd !link! (2026)
These codes allow you to check hardware, software, and diagnostic information directly:
On many updated Oppo phones, *#*#3646633#*#* (Engineer Mode) no longer works due to MediaTek restrictions in ColorOS 11+. You may need third-party apps like MTK Engineering Mode (requires root or ADB). how to use secret codes on oppo a9 2020 upd
