Xiaomi 9 mobile phone forgot the password. What if it is locked?

The first method: double erasure, commonly known as hard boot, is an operation to erase mobile phone data. Erase refers to restoring factory settings, including deleting all contacts, text messages, installed software, etc. The mobile phone can be used normally after being removed.

The second method: use the software to unlock the phone, which can keep the information in the phone. The operation is simple, and there are many tutorials on the Internet, so you can check them yourself!