1. Your mobile phone has been refreshed/updated/restored to factory settings, resulting in the disappearance of private information. If your housekeeper is stored in the phone memory, there is no way to restore the factory settings; If your housekeeper loses the information stored in the SD card, it is usually because the SD card database and encrypted files are destroyed during the operation. You can try to retrieve it through some data recovery software.

2. Other software with "cleaning" function is installed in the mobile phone, and you use this function again, resulting in the loss of private information. You can try to recover the data with USB flash drive software.

3. Recommendation 1. When encrypting, move the sd card file to the built-in card before encrypting;

Recommendation 2. You can turn off the option of "System Settings-Developer Options" and try again to see if you can enter.