Default [HELP] Wifi Error on P350

Hi,
i'm experiencing a problem on my P350. After installing a custom firmware, i decided to restore the original stock rom by KDZ.
I cannot activate wifi(it says error), i connected the device to logcat and i get this error:

E/WifiHW ( 1381): wifi_load_driver=>driver module path error
E/WifiService( 1381): Failed to load Wi-Fi driver.

I've tried to restore the wifi by using Wifi Fixer app, but it crashes when i click on the button on the top right of the application.
I've also performed a factory reset again and again...

What can i do? Thank you