Solution:
1. Power off of the product first;
2. Then press and hold the "appointment" key and plug in the power cord at the same time to power on, and release the hands after the 5S panel lights up, the factory firmware is restored;
3. Power will be cut off after recovery, and the power will be turned on normally again;
4. Connect the phone to the rice cooker, check the firmware update and upgrade the latest firmware.