Ensure the QCN file matches your specific model variant (e.g., a Global ROM QCN might not work on a Chinese hardware variant). Conclusion
| Problem | Safe Solution | |---------|----------------| | QCN corrupted | Use (Qualcomm Product Support Tools) from Qualcomm’s official site + your own backup | | IMEI = 0 after flash | Reflash stock firmware (including persist partition) from manufacturer | | Baseband unknown | Flash correct modem firmware for your exact model | | Phone blacklisted (bought used) | Request carrier to remove block with proof of purchase – not IMEI tools |
Ensure the QCN file matches your specific model variant (e.g., a Global ROM QCN might not work on a Chinese hardware variant). Conclusion
| Problem | Safe Solution | |---------|----------------| | QCN corrupted | Use (Qualcomm Product Support Tools) from Qualcomm’s official site + your own backup | | IMEI = 0 after flash | Reflash stock firmware (including persist partition) from manufacturer | | Baseband unknown | Flash correct modem firmware for your exact model | | Phone blacklisted (bought used) | Request carrier to remove block with proof of purchase – not IMEI tools |