Now it is in reboot loop, it's rebooting every 2 minutes. What should I do to fix it?
iPad (4th gen) Wi-Fi + Cellular (MM), iOS 7
Reset the device:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
Unfortunately, it doesn't help.
Also I've tried to put my device in the recovery mode and restore it with iTunes (11.1.0.126). But process ended with error "It's impossible to restore iPad. Unknown mistake (1) occured.
And now I can't even turn it on. I see only iTunes logo and offer to connect to it.
Reset doesn't change anything.
The second attempt to recover gave the same result - an unknown error (1) occured.
The worst day of my life.😢
Worst day of your life? Really?
Try pressing sleep and home button at the same time. If that doesn't help try bringing it to the closest Apple store
Head dame problem, the apple care service told me I had to pay 161€ to fix it up. Nevertheless I fixed it by holding down power and home buttons, but as soon as screen goes off, kept home button pressed and plugged in USB cable quickly, and kept pressing the home button until the iTunes logo appeared on the screen.
It works now! :)
Hope it helped
I've updated my iPad (4th gen) to iOs 7.
