My soft keys isnt working :(

hi when i holding home button recent apps wasnt disappeared.So i tried to change some keys feature with using system/usr/keylayout/Generic.kl

Ofc i backed it up first.

First i succesfuly changed to switch apps to left soft key but i cant used it normally so i decided to get recent apps to holding soft key.I did some **** but i messed up :( now left and righ soft key (back and another button :D) isnt working.Home key still working but still doesnt appear when i hold it.So i restored the old file and rebooted but it didnt worked.I did a few things more but didnt worked.Im pretty sure it isnt hardware.It should be software because lights working when i touched them.How can i fix it ? I really need your help.

PS : I have a backup from 3-4 months ago but i dont wanna use it if it isnt necessary also im not sure it is gonna fix it.

Also sorry for my bad english i dont know very well.I really appericate if you can fix my problem before tomorrow :)