You're looking for information on the QCN IMEI repair tool. Here's what I found:
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: Incorrectly flashing a QCN file from a different model or region can permanently disable the phone's ability to connect to any network. qcn imei repair tool
The is neither good nor evil—it is a tool. For a technician or a power user, it is a lifesaver that turns a bricked, network-less phone back into a functional communication device. For a thief, it is a weapon to circumvent security. You're looking for information on the QCN IMEI repair tool
Imagine inserting your SIM card into your smartphone, only to see the dreaded words: "No Service," "Invalid IMEI," or "Not Registered on Network." Your phone has become a Wi-Fi-only tablet. For many users, this is a nightmare scenario. The culprit is often a corrupted (Qualcomm Calibration Network) file or a nullified IMEI (International Mobile Equipment Identity) number. The is neither good nor evil—it is a tool
Specialized editors allow users to "rebuild" a QCN file by injecting a specific IMEI number into the file before flashing it back to the device. Hex Conversion: