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To replace Overlay Source, Please follow the steps outlined as follows.
1) To replace background source saved in Window 7, rotate ENTER knob to move the cursor to
Window 7, then long press ENTER knob.
2) Rotate ENTER knob to move the cursor to Replace, then press the knob once again.
3) Then the cursor will automatically jump to USB files on the left side. Rotate the ENTER knob to
select one overlay source in the U disk, and then press the knob once again to replace.