Convert V5 fat mode to V7 fit mode[V5 TO V7]

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During AP restart, press Ctrl+B to enter BootMenu extended section 

 ===========================<EXTEND-BOOTWARE MENU>===========================

|<1> Boot System                                          |
|<2> Enter Serial SubMenu                                    |
|<3> Enter Ethernet SubMenu                                  |
|<4> File Control                                         |
|<5> Restore to Factory Default Configuration                      |
|<6> Skip Current System Configuration                           |
|<7> BootWare Operation Menu                                  |
|<8> Clear Super Password                                    |
|<9> Storage Device Operation                                 |
|<0> Reboot                                             |
============================================================================
Ctrl+C: Display Copyright
Ctrl+Y: Change AP Mode
Ctrl+F: Format File System
Enter your choice(0-9): //Ctrl+Y

Please select the new mode
Current mode is Fat
============================================================================
|NO.  Mode                                             |
|1    Fat Mode                                          |
|2    Fit Mode                                          |
|0    Exit                                            |
============================================================================
Enter your choice(0-2):2
Warning:Change from fat mode to fit mode formats the storage meduim! Are you
 sure to continue ? [Y/N]Y..................................................
.................................................
Formatted the storage medium successfully!
Changed to fit mode successfully!

After the AP is changed to the thin mode, the flash of the device will be formatted. After the format is successful, the AP can be registered to the adapted V7 AC to complete the conversion of the AP system version from the V5 fat version to the V7 FIT version.