Common reasons for IMEI loss or corruption include:
Note for A16K: If you get a "USB Device Not Recognized" error, you need to short the test points or use an Auth Bypass DA (DFT Pro includes this). oppo a16k imei repair dft pro
| Error Message | Cause | Fix | | :--- | :--- | :--- | | | Driver conflict / USB issue | Reinstall VCOM drivers. Use USB 2.0 port. | | "DA Auth bypass failed" | OPPO security patch > 2022 | Use DFT Pro's "Auth Bypass" button first. Or load the MT6765.auth file. | | "IMEI Write OK but phone shows null" | Security partition mismatch | You must perform a Factory Reset immediately after writing IMEI (Settings → Factory Reset). | | "Unknown Baseband" | Modem firmware is missing | Flash the original Modem A/B partitions using DFT Pro's "Write Firmware" option before IMEI repair. | | "Invalid IMEI (SVN: 00)" | IMEI is written but checksum fails | Reboot to recovery → Wipe cache → Reboot. | Common reasons for IMEI loss or corruption include:
, have high-level security that prevents direct IMEI modification . To bypass this, technicians often have to downgrade the firmware | | "DA Auth bypass failed" | OPPO
In the world of smartphone maintenance and software repair, few issues are as debilitating as a null or invalid IMEI. For owners of the popular budget device, the , this problem can transform a fully functional phone into a fancy paperweight. Without a valid IMEI (International Mobile Equipment Identity), the device cannot register on a cellular network, rendering it unable to make calls, send SMS, or use mobile data.
If you still face "Null IMEI" after these steps, your device likely has a damaged partition that requires a full flash file from a donor device — an advanced repair that involves hex editing. For 95% of users with simple IMEI nullification, the guide above will restore full network functionality.
When this happens, dialing *#06# on your keypad will usually return "Invalid" or show blank spaces. This is where comes into play.