If you cannot access the system or want to downgrade/clean install, you will need to use the (also known as MSM Download Tool).
Uncheck the file option in the partition list. (Crucial step: Flashing a mismatching preloader can hard-brick MediaTek devices. Only flash the preloader if your device is already completely dead/bricked). Open your MTK Bypass Tool and click on Bypass .
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Press and hold the buttons simultaneously until the Oppo logo appears, then release to enter Recovery Mode. Select your preferred language (English).
Use this method if your phone is stuck in a boot loop or will not boot to the home screen.
Boot the device into stock recovery mode (Hold Power + Volume Down ). Select Wipe Data / Factory Reset , confirm the choice, and reboot. This clears conflicting cache data from the old ROM.
: Before downloading, verify your chipset by entering the secret code on your dialer. Qualcomm Variants : Usually require the Qualcomm Flash Tool for manual installation. MediaTek (MTK) Variants : Require the SP Flash Tool Official Upgrade Tool : OPPO provides an official System Upgrade Tool
For the 2016 Qualcomm model: Install .
Open the extracted folder and launch as an Administrator. Turn off your Oppo A57 completely.
The PC software should detect the device and assign a COM Port.
Adds complete, system-wide localization for dozens of international languages.