8. Loosen 2 pcs M3*6 screws on the back cover, and then tear
down the back IR board.
9. Loosen 4 pcs M3*6 screws on the back cover, and then tear
down the Keypad board.
10. Loosen 1 pcs M3*6 screw on the back cover, and then tear
down the RJ-45 board.
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