My iPhone worked well except the fact that the battery was very used.
I change my battery by following these instructions and I succeed to disassemble and reassemble my iPhone without any difficulty. However, after having turned on my device, the cellular connection didn't work with the new battery. As written in the tutorial, I tried to restore the device using iTunes (in DFU mode and not). This message appear: "the iphone could not be restored: an unknown error occurred (1)".
