Most CPH1933 units (A5/A9 2020) use the Qualcomm Snapdragon 665. Here is the professional, exclusive repair path.
Some early CPH1933 models use MediaTek. The exclusive repair here is different. oppo cph1933 imei repair exclusive
Note: This method fails 70% of the time on Android 11 due to SELinux restrictions. Only use if you have no other option. Most CPH1933 units (A5/A9 2020) use the Qualcomm
If you cannot afford a dongle, you can try the root method. This is software-exclusive because the CPH1933 has a locked bootloader that requires an authentication file. Reboot
If UnlockTool fails (e.g., you have a DA (Download Agent) error), use CM2 with a custom DA file.
Why this is exclusive: Most people don't know that the CPH1933 requires a signed DA for security bypass.