Step1 Unlock your phone and go to Settings. Step 2 Scroll down and open About phone. Step 3 Under About phone, find Build Number or Version and tap seven times on it. Step 4 You will get a message on your screen that "you are now a developer".
OPPOF7 Wifi Issues Slow And Disconnect - How To Fix It Go to Settings > Wi-fi Settings > Choose Wi-fi name > Tap on the «forget» option and then reconnect. Try to check if the problem is due to power saving/battery saving mode. Note that battery optimization is disabled for Android Auto and Google Play Services.
Hereis the complete guide about How to entering into Recovery mode on Oppo Mobile. Oppo F7; Oppo R15; Oppo A75s; Oppo A75; Oppo A83; Oppo A79; Oppo F5 Youth; Oppo R11s; Oppo R11 Plus; Oppo R11; Oppo N1 Mini; This option used by developers to change firmware and recovery etc with ADB (Android Debug Bridge).
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how to disable developer mode in oppo f7