It depends on the method. A "Clean Flash" via EDL wipes the system partition entirely, installing only the Global apps. A dirty flash might leave Chinese residual apps in the /data partition. A clean flash is recommended.
OPPO utilizes an authorized flashing system. To flash an official Global ROM onto a Chinese device, you generally need access to the official OPPO Flash Tool, which requires authorized service center credentials to log in. Because of this, standard users cannot easily download a ROM zip file and flash it via standard recovery. SafetyNet and Widevine Issues
For official support or to check your device's current software status, you can visit the OPPO Global Support Page specific tools required for flashing or a guide on how to install Google Play without changing the ROM? oppo a5 china to global rom better
: Converting a China-region Oppo A5 to a Global ROM is not officially supported by Oppo and often requires unlocking the bootloader, which they have made extremely difficult or impossible.
The hardware inside a Chinese OPPO A5 is virtually identical to the global version, but the user experience is drastically different due to the software layer (ColorOS). China ROM Overview It depends on the method
OPPO implements ARB to prevent users from downgrading firmware. If your China version has a higher ARB index than the Global ROM you are trying to flash, the device will reject the flash or, worse, hard brick (rendering the device permanently unusable).
After flashing, you may find that Wi-Fi works, but mobile data doesn't. A clean flash is recommended
For most Oppo phones, the safest way to change regions is by using specialized flash tools like the OPLUS EDL Tool or Chimera Tool .
However, because Oppo aggressively blocks cross-region flashing, trying to manually convert a Chinese Oppo A5 to a Global ROM is highly risky and generally not recommended for average users.
Before you change the ROM, it's worth noting that the Chinese version isn't without its advantages. Chinese ROMs sometimes receive cool, exclusive features that might never hit the global market. Additionally, they often receive system updates faster than any other region.