Removal of Chinese-specific apps and services that cannot be uninstalled or disabled in the domestic version.

The conversion works because OPPO often uses identical chipsets (Qualcomm Snapdragon 435) across regions. The Global firmware supports the same hardware drivers, making a cross-flash possible.

is primarily for updating within the same region and generally does not support region switching. Alternative: "Globalizing" Chinese ROM

Once the process is finished, your OPPO A57 will reboot into the Global ColorOS setup screen. You’ll now have access to the Google Play Store , all local languages, and no Chinese system notifications. Need the firmware links? Check out community forums like XDA Developers