Mercusys mr70x v1 When using the official firmware upgrade, it prompts invalid files

mercusys mr70x v1 When using the official firmware upgrade, it prompts invalid files.
Directly use the original firmware upgrade interface.
I have checked that this device is supported.

tried the web UI recovery page ?

web ui There is no place to add files in restore.

Restore settings from a backup file.
This can add files, but this is a settings file.
A backup file error will be displayed

Restore settings from a backup file.
This can add files, but this is a settings file.
A backup file error will be displayed