If you cannot safely flash a full Global ROM, you can still make the device functional for international use: Global Version vs. China ROM | Uniqbe Limited
Some third-party technicians use specialized tools like the UnlockTool to force a region conversion, but this is risky and usually requires professional experience. Oppo A5 China To Global Rom
Officially, . Oppo has made it increasingly difficult to unlock bootloaders, which is a prerequisite for flashing a different region's ROM. Flashing an incompatible ROM can result in a "bricked" (permanently disabled) device. If you cannot safely flash a full Global