Do not search for “Imei Qcn Tool Download” unless you are an experienced repair technician with a clean, isolated PC and a full legal right to modify the device. For 99% of users, the correct fix is reflashing stock firmware or contacting the manufacturer.
A .qcn file is a binary file format used by Qualcomm to store Non-Volatile (NV) items. This data is stored in the device's EFS (Encrypting File System) partition. Imei Qcn Tool Download