It worked for about a month, and then a red LED stays on all the time and my car is no longer recognized.

1. Please try replacing the USB cable. Replace the Ottocast product's USB cable with your phone's data cable, reconnect the device and check whether it works normally. If the problem is resolved after replacing the cable, the USB cable may have worn out due to long-term shaking or vibration. It is recommended to place the product in a stable position to avoid further damage.

2. Try resetting the car's multimedia head unit, and then reconnect.

3. If it still does not work, use a small pin to press and hold the product's reset hole (see the picture) for 15 seconds to reset the product, and then try reconnecting.