M654 Firmware — China Mobile

✅ I have confirmed my exact M654 hardware version. ✅ I have a full readback backup (Preloader + NVDATA + NVRAM). ✅ I have downloaded the firmware from a trusted source. ✅ My USB A-to-A cable is known good. ✅ I am ready to accept the risk of a permanent brick.

: Use the key combination Volume Up + Power to enter the recovery menu. china mobile m654 firmware

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Device not detected at all | Dead bootloader | Short test points on PCB to force download mode (advanced) | | Only CD-ROM appears, no modem | Wrong USB switch mode | Send AT+MODE=1 via virtual COM port | | Flashing stops at 10% | Driver conflict | Use a different USB port, disable antivirus | | IMEI = 0 (or AT+CGSN returns error) | NVRAM wiped | Restore IMEI via AT+EGMR=1,7,"YourIMEI" (if allowed) | | Slow speed after flash | Wrong band configuration | Revert to original firmware or manually set bands | | SIM not recognized | Voltage mismatch (1.8V vs 3V SIM) | Use an older 3V SIM or reflash firmware with correct SIM driver | ✅ I have confirmed my exact M654 hardware version

, the map that would tell his computer exactly where every byte of data belonged. ✅ My USB A-to-A cable is known good

" firmware can result in a or loss of IMEI (network signal) due to different modem configurations.