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How to reboot a umx model u670c?

You may find the answer in the thread:

push the power and the menu button. when triangle appears push the back button. then select reset using the volume button. to make a selection push the menu button. gotta be fast tho... it should ...  
I did everything that it says to do all it does is stay at the triangle  
Press and hold power & vol down until it boots up,press back button then vol down to factory reset, (third line down) press the menu button.it will flash on a different screen but you wont be able ...  
Wont let me select with menu to rest phone  
my phone is on but it's just showing a white screen. what should or would i have to do next for it to come back on period?  
hold down the volume down button and power button until you see the triangle and the android guy then you push the back button and the menu comes up then you use the volume button to select phone ...  
hold down the volume down button and power button until you see the triangle and the android guy then you push the back button and the menu comes up then you use the volume button to select phone ...  
... green message box on my u670c Android net 10 phone. It ...  
it goes to a white screen after i try to reboot it it goes to a triangle with a ! in the middle with a droid person than goes to a white screen than dont do nothing else  
... visit and he gave me a UMX mxc-570 phone for my ...  
... 'service' button may differ on UMX Max (more often than not ... the following command: adb shell reboot recovery.  

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