Unresponsive iPhone 5s
After upgrading (to be more specific yesterday night) my iPhone 5s with 8.1.3 to 8.2 my iPhone became extremely slow! I restarted my iPhone and everything seems to be normal again! This morning I tried to make a call and my iPhone died...! I tried to turn it on but iPhone appeared in its screen the battery message (despite it was about 50% already charged)! I plugged in my iPhone and I tried again this time with success! After all I decided to reset my iPhone (through: Settings -> General -> Reset -> Reset All), end then my iPhonereboots all the time automatically without success! I connected my iPhone to my Macbook but iTunes does not recognize my iPhone!!!
Plz help
Jim
iPhone 5s, iOS 8.2, null