How To Use Secret Codes On Oppo A9 2020 Upd _hot_ ✔ <Tested>

: Enters an automated TTFF (Time to First Fix) test for GPS.

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