(1) Connect USB flash disk with PC
(2) Format USB flash disk (File system: FAT32 , 4096 byte)
(3) Copy the "xxxx .APPU" file into the root of USB flash disk
(4) Connect USB flash disk with machine
(5) Power on and machine will upgrade automatically
(6) Power off when "Upgrade Finish" shows, and take off USB flash disk 

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