remount failed: Operation not permitted

1. Make sure the phone is connected correctly

adbdevices

2. Enter the shell

adbshell

3. Input the command in the shell (the # sign at the front of the command does not need to be input)

#su

#mount-orw,remount-tyaffs2/dev/block/mtdblock3/system

#chmod777/system

#exit

4. Then you have read and write permission to the system directory. For example, you can use ADB push to push files to the system directory, or delete system files

If you don’t have the Su permission, please select root by yourself first