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, which are small blocks of data stored in the permanent memory of the modem. These items control critical hardware and software parameters, including: Network Calibration : Frequency bands and signal strength settings. Device Identifiers

: If a device's IMEI becomes "Null" or "000000" due to a corrupt firmware flash, this tool can write the original IMEI back to the NV items. Network Calibration download nv-items-reader-writer-tool.zip