: If the installation fails, the download might be corrupted. Try downloading the file again using a stable Wi-Fi connection.
The Oppo A57 (model number CPH1701/CPH1707) does have a native “Install from SD card” option in its stock recovery for full ROMs – only for official OTA update packages. To perform a true flash, you need to prepare your SD card correctly. flash oppo a57 via sd card work
Now that you are in the Recovery menu, follow these steps to install the software: Select . Choose Install from SD card . : If the installation fails, the download might be corrupted
Charge your phone to at least 40–50% to prevent it from shutting down during the process. : If the installation fails
Using the volume keys to navigate and power key to select: