Dual audio DXDM280BT setup menu problems

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I'm a newbie when it comes to all the new audio stuff.i just got a dual audio 2 din head unit.all of the speaker,and tweeters are factory.it works great! but a few problems.i got the user manual.I'm trying to set the clock and get into the setup menu.it says hold down DSP and wait till it blinks turn volume knob to change time...Everytime it starts blinking I turn the knob and all it does is adjust the volume and sends me back to the main menu...any ideas?THANK YOU
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