2）
Upgrading method 1
1，using the remote, enter the “Picture” submenu of the OSD;
choosing the “contrast” item and press 9,7,3 and 5 in series,
Factory Menu will appear in the left top of screen.
2,Select the “USB UPDATE” item , press left or right key to enter
the update box;
3,Select “YES” of the dialog box and press OK button to start the update,