ETC shows that no tag is detected, indicating that the equipment is currently unavailable and needs to be reinstalled and activated at the original handling point or any high-speed ETC business hall. The installation process of ETC is as follows: After receiving the equipment, first check whether the ETC card and electronic tag (OBU) are damaged. Press the anti-disassembly button on the back of OBU, and the red light will light up briefly. The words "invalid signature" and "please insert the card" will be displayed on the OLED screen, indicating that the equipment is normal. Clean the front windshield, keep the glass surface smooth, clean and dry, then tear off the OBU adhesive protective film, stick it on the installation position, and press it by hand for 2-3 minutes to drive away bubbles. The front of ETC card faces the driver and the back faces the front glass, and the chip part should be inserted into OBU equipment. ETC activation method: Plug and unplug the ETC card twice continuously until "Bluetooth on" is displayed on the electronic tag screen. If you plug and unplug it twice without attaching an electronic tag, "invalid tag" will be displayed, which is normal and does not affect activation. You can also directly press the button at the top of the electronic tag to turn on the Bluetooth function. Turn on the Bluetooth of the mobile phone, open the corresponding mobile APP (there is a download QR code on the general electronic tag), and enter the device activation interface. Click the device connection, and wait patiently for the prompt of "successful connection". After the connection is successful, upload the front photo of the vehicle and complete the activation.