error 29
i have an iphon 4s which was bot in 2012, lately its been acting funny it switched off and when connected to power it comes up only aftr witching on few times
today i tried updating software to 8.4 and connected to itunes but its giving an errror code 29 aftr the update is half way and the fone shows the usb power icon
plz help what can be done
thanx
iPhone 4S, iOS 8.3