reset samsung level u pro I have a Samsung level u pro anc , the problem is the sound balance in left and right ear are not the same , it's not related to software or anything else.

actually there was similar situation before and some one just reset the device by holding some buttons on the device and it balance again . 

now the problem is back and I can not figure it out how to solve it.
 the headset has three button for call and volume up and down. and a toggle button with 3 situation for off , on and paring mode .
I appreciate any help to solve the problem .
@soha1410 turn off the headset then Hold volume down and up together then slide and hold the power button to the end right until the led flashes