Connect your phone. 3. Install OTA assistant on your phone. 4. Check the new version. 5. Download new version and update. Get the latest OPPO firmware updates to optimize system performance and enhance system stability. Download the latest ColorOS software version now! 1. Use USSD code to activate Andriod engineering Mode. Accessing engineering mode using USSD code is different from one Android smartphone to another Android smartphone. Also, the settings, and opting you get in this method are limited. Open Default Dialer app on Android. Dial *#*#3646633#*# or *#446633#. Switch off your device. Press the down power key and the volume button at the same (Power key + Volume down key) release your fingers when the OPPO logo appears, you will enter the recovery mode within a few seconds. Select the language. Press on the 'wipe data and cache' option. Select 'YES', when the data and cache have been wiped. With Pixel Experience custom rom on your Oppo A39 , you will have a full fledged google pixel-like experience. Here are some features you will have. Pixel initial configuration procedure. Stock Android user interface. Availability of all Google Apps. Round icon Pixel Launcher. Pixel Boot animation. jfC6.

oppo a39 custom rom