If your GT-120B/GT-600B doesn't turn on, cannot be paired via Bluetooth BLE, or exhibits any unusual behavior, you could try resetting the device by following these steps:
- Download and install the Windows version of the i-gotU software. http://www.
- Connect the GT-120/GT-600B device to your Windows computer using a USB cable.
- Open the i-gotU GPS software. Click on the i-gotu device, then click on the "Configure" button. Select the "Reset" option and press the "Update" button.
4. After resetting the device, you can turn it on again and check if the issue has been fixed.