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all the keypad or the main only or the menu or even the volume and camera key
before any thing remove the ( memory card )and do formatting *#7370#and 12345 or your lock code if not test this
1-if the main key pad 2 sol.1st try another ui(user interface )
2nd the filter on the mb beside the key pad con.(z2400)the manual of n81
2- the menu please check under the cover and under the do-mme sheet if there is any water or short if not change the main fpc and then the second step like before
3-Please check if there is any stuck key
open the front key face by placing a card on the side of the phone. careful not to poke it harder as there are some chips inside the front slide. once it is open, clean it or try to adjust the keypad face then place it back. If problem still exist, bring it to the mobile center for repair.
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