need wifi fix after flashing stock rom !!!!!!!!!!!!!!!!!!!!!!!!!!!!

hi
i flashed that custom lollipop rom and then i restored to the stock rom and i found out that the wifi wasn't working so i tried to apply this method on multiple pc's but it didn't work on any one of those cmd always tells me that my devices isn't detected or when it is detected it tells me that i can't flash persist.img .....
i'm just wondering if there's a solution for this problem or if there's another way to flash persist.img other than adb and fastboot method
help me pls !!!!!!!!!!!!!!!!!!!!!!!