As long as it's jailbroken they will about 99.9% turn you away. is it going into dfu mode at all can you update the firmware? Apple doesn't really repair they replace out of warranty is $199. if it's really a headache you can drop it in the toilet run it over with a truck and they replace it for $199 no questions asked. shoot I4 is probably still in warranty. Iclarified has the best dfu tutorials imo