Hi,
I've started iOS 9 Beta 4 installation via OTA on top of iOS 9 Beta 3.
The installation started successfully and currently I can see the Apple logo and a progress bar below it. The progress bar is around 85% but it's been staying there for around an hour now.
I've tried plugging in the charger but there is no response (no sound/vibration/brightness change etc.)
Is this expected behaviour? Should I wait for another hour or should I (and how) intervene at this point?
Thanks!