TCL L28D2710PSA Service Manual page 18

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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,