Answer: ramblers often crash. The solutions are as follows
 1. The Bluetooth headset is dead, and the factory settings cannot be restored.
 2. The factory settings can be restored after the headset is restarted.
 3. Turn on the Bluetooth headset, delete the pairing record before the phone, and then press and hold the multi-function key of the Bluetooth headset when the headset is powered on and charged. When the headset indicator turns red and blue, it flashes alternately, and then search for the Bluetooth device again before connecting.
 4. Turn on the headset first (no need to enter the code matching state), and then charge the headset for 5-10 seconds. If most headphones are charged when they are turned on, the headset will automatically shut down, and the machine will be forced to return to the factory state.