If your bootloader cannot be unlocked, or if you are a novice user, Instead, use the "Google Services Installer" apps available within the ColorOS App Store (or via third-party installers like GBox). This allows you to run Google apps on the Chinese ROM without risking your device.
Select the "Flash" or "Convert to Global" option in the software. 2. Official System Upgrade Tool HardReset.Info oppo a5 convert global
The most common way to "convert" these devices is by flashing a Global firmware file using specialized service software. Tools Required : Most guides recommend tools like UnlockTool If your bootloader cannot be unlocked, or if