Answer
Keep pressing the Brightness/Volume button (+) or (-) for 3 seconds, it will switch current mode (Brightness Control or Volume Adjustment) to another (Volume Agjustment or Brightness Control).
For Brightness Control, it will go up/go down one step whenever you hit [+] or [-]. There are 10 steps for you to swtich.
For Volume Adjustment, it it will go up/go down two steps whenever you hit [+] or [-].
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