Hi everyone! I came to the forum because i have my brother's iphone 6, and i am trying to fix it, because, he was updating his phone to version 8.4. But then in the iMac when i am Updating in itunes from recovery mode to FACTORY SETTINGS.. The iphone gets stucked in halfway of the extraction, and iTunes notification appears saying. (ERROR CODE 53) I tried everything! But nothing seems to work whatsoever. If anyone has solved this issue please reply to me it will be amazing help! Thank you!