If the process is interrupted or the wrong files are flashed, your ZTE MC801A may become a "brick" (permanently unbootable). Tools Required
How to Change IMEI on ZTE MC801A: A Complete Technical Guide
Always ensure your router is running a "global" or "unlocked" firmware version before starting, as carrier-locked versions (like those from T-Mobile or Three) often have the diagnostic ports permanently disabled.
Some firmware versions allow direct IMEI writing via AT commands in a terminal emulator. The command typically looks like: AT+ZIMEI="your_new_imei" . Step 4: Verification
Users edit the QCN file using a Hex Editor, search for the original IMEI (encoded in hex), replace it with the new one, and then restore the modified QCN to the router.