Ursprünglicher Beitrag von: jay grand ,
From my place it seems to be that if the screen is an 'after market' one. (i.e. non apple). then it comes with some firmware whcih isnt compatible with the apple firmware button. the new screen firmware is identified and blocked by apple. Try a full restore and if a full restore is prevented by iTunes because it doesnt recognise your phone then this is most likely the answer.