Text messages and photos suggest no memory.

There are two ways to format your phone.

One is to recover the stored information from the field and delete all the later stored information.

This is called soft unit *#7370#, which is similar to deleting everything on the hard disk.

The other is full rom recovery, which is the same as brushing. The so-called hard disk is similar to formatting a computer hard disk. The method is to hold down the * key, the 3 key, the dialing key and the power key at the same time, and then release them after the handshake icon appears.