mobile

i pluged my g2 d802 to pc tell me there is update version after the update there s the big problems
1-the screen going crazy(exemple if you click back touche contact wil show) knock dont work
2-no network at all network option showed grey
3-the storage was 32gb now 16gb
after some searche on ggole found that my country algeria has only 16gb firmware and i buy the phone from used phone store please help