This is an unofficial archive of firmware, software, and manuals for the FNIRSI FNB48S USB Tester.
- Open the FNIRSI USB Meter upgrade tool.
- When the meter is off, press the middle button to access the PC online port, it will display the connected, device model, and device firmware version.
- Click OPEN and choose to upgrade the firmware.
- Click START to start the firmware upgrade. After the upgrade is completed, the meter will automatically restart