You can't just run the tool and connect your phone. Several key steps are required:

Do not attempt to connect MediaTek (MTK), Exynos, or Tensor chips to this software. It is strictly coded for Qualcomm Diagnostic protocols. How to Download NV-Items Reader Writer V1.0 Safely

For everyone else—enthusiasts, IT pros, and casual modders—the risk heavily outweighs the reward.

Open Windows and verify that a device appears under "Ports (COM & LPT)" labeled Qualcomm HS-USB Diagnostics [COMXX] . Note down the COM port number. Phase 2: Connecting to the Software

Select the exact COM port number you observed in Device Manager.

The tool might produce ERROR or fail to read if the DIAG mode is not properly activated.

IMEI numbers, MEID, ESN, and baseband configurations.

Writing incorrect NV items can permanently damage the modem firmware, rendering the phone a "brick". Always backup before writing.

NV-items Reader Writer is a low-level utility designed to read, back up, modify, and write variables on systems using UEFI firmware. NVRAM stores critical boot configuration data, including: