If you cannot afford a dongle, you can try the root method. This is because the CPH1933 has a locked bootloader that requires an authentication file.
Facing the “Invalid IMEI” error on your OPPO CPH1933? This exclusive guide covers professional repair methods, root-based tools, Meta Mode, and security precautions to restore your device’s identity permanently. oppo cph1933 imei repair exclusive
For Oppo devices, including the CPH1933, common tools and methods might involve: If you cannot afford a dongle, you can try the root method
: Professional technicians may need to re-ball or replace this IC to restore functionality. Oppo A5 (2020) - Full phone specifications - GSMArena.com If you cannot afford a dongle