What is the reason for the ETC tag being invalid?

[ElenaMarie]

ETC displaying "Tag Invalid" indicates that the ETC electronic tag is not activated. You need to take the ETC device to an ETC service center or ETC service point for inspection. If the invalidation is not caused by human factors, simply performing a secondary activation of the ETC will allow it to be used. ETC installation process: Upon receiving the device, first check if the ETC card and electronic tag (OBU) are damaged. Press the anti-tamper button on the back of the OBU; the red light will briefly turn on, and the OLED screen will display "Tag Invalid" or "Please Insert Card," indicating the device is functioning normally. Clean the front windshield to ensure the glass surface is smooth, clean, and dry. Then peel off the adhesive backing of the OBU and stick it to the installation position. Press firmly for 2-3 minutes to remove any air bubbles. Insert the ETC card with the front side facing the driver and the back side facing the windshield, ensuring the chip is inserted into the OBU device. ETC activation method: Insert and remove the ETC card twice in succession until the electronic tag screen displays "Bluetooth On." If inserting and removing the card twice while the tag is not attached shows "Tag Invalid," this is normal and does not affect activation. Alternatively, you can press the button on the top of the electronic tag to enable Bluetooth. Turn on your phone's Bluetooth and open the corresponding mobile app (usually, a download QR code is provided on the electronic tag). Enter the device activation interface. Click "Connect Device" and wait patiently for the "Connection Successful" prompt. Once connected, upload a photo of the vehicle's front to complete activation.