After upgrading ios version from 8.3 to 8.4 on iphone 6 plus my device did not turn on.
I tried to do it also via itunes and even to restore but it did not help. what should i do?
iPhone 6 Plus, iOS 8.4
Let it charge for a while. Force your device to start. To do this, press Sleep/Wake and Home buttons and hold them for at least 10 seconds.
If this does not help, take a look these Apple Support articles:
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.
As a final step, try the recovery mode. Turn your device off, then plug it to your computer with the home button pressed. You will need to have iTunes installed on this computer. Keep the Home button pressed until you see the iTunes logo on the screen of your iPhone. After that on your computer you should see the iTunes window saying your iPhone needs to be restored to factory settings. Click on the restore button.
More info here: https://support.apple.com/en-us/HT201263
problem with iphone 6 plus after an ios 8.4 upgrade
