[DSP-1000/1000W] Why I always stay at Library menu, and can’t entry Main Menu to update firmware from my storage device by manually?

Press the "Setup" button from remote controller and get into Setup Menu, to setup the below option:
MISC1: Play list -> Off
MISC2: Play Mode -> Standard
Press the "Setup" button from remote controller again to leave Setup Menu, it will stay at Main Menu. Chose the "Firmware" icon and storage device (HDD/PC/USB), and refer to 3.8 Firmware Update from user's manual for detail information to update firmware by manually.