Firmware Update

Firmware updates add features, fix bugs, and improve measurement accuracy. The NanoVNA-F V3 uses a simple USB file-copy method — no special flashing software is required.

Download the firmware

1. Visit the official firmware page at sysjoint.com.
2. Locate the latest firmware file for the NanoVNA-F V3.
3. Download the file. It will be named update.bin.

Caution

Only download firmware from the official sysjoint.com website. Third-party firmware files may damage your device or void your warranty.

Enter U-disk mode

1. Connect the NanoVNA-F V3 to your computer via the USB-C cable.
2. Power off the device if it is currently running.
3. Hold the middle button and power on the device simultaneously.
4. The device enters U-disk mode and appears as a removable USB drive on your computer.

Copy the firmware file

1. Open the USB drive on your computer.
2. Copy the update.bin file to the root of the USB drive.
3. Wait for the file copy to complete fully.
4. Safely eject the USB drive from your operating system.

Caution

Do not disconnect the USB cable or power off the device while the file is being copied. Interrupting the transfer can leave the device in an unusable state.

Apply the update

1. Disconnect the USB cable.
2. Power off the NanoVNA-F V3.
3. Power it back on normally (without holding any buttons).
4. The device detects update.bin and applies the firmware update automatically.
5. The update process takes a few seconds. The device restarts when finished.

Verify the update

After the device restarts:

1. Tap CONFIG → ABOUT.
2. Check that the firmware version matches the version you downloaded.

Tip

After a firmware update, it is good practice to recalibrate the device. Some firmware updates may alter calibration behavior or add new calibration features.

Note

The update.bin file is automatically deleted from the device storage after the update completes. You do not need to remove it manually.