Q: Stuck at "slide to upgrade" IOS 9

My iPad will not even connect to my computer. It is stuck on "respond to iPad" when I try to connect  it to iTunes. But I am having this issue as well. How can I get around this?

Just an update on my latest iPad state.  I think it is good news!

My first of iOS 9 installation ended with the iPad unable to boot up after being powered off.   I restored to iOS 9 on my iPad as previously described (first install as setting up a new iPad, then apply my saved backup).  I did that on Wednesday.  But, I was still noticing the occasional hanging Apple logo screen. I did not try powering off to see if I could get back.  Before just going back to iOS 8.4.1, I discovered the newly-released iOS 9.0.1 which came out on Wednesday.  I figured I had nothing to lose by installing it, since I could probably still revert to iOS 8.4.1 if needed.  I am happy to report that all the hanging Apple logo screen problems are gone with this update, I have powered off and on just fine, I have also done a hard restart just fine.  The iPad seems to be running more smoothly, too.

I then encountered nasty "Waiting..." app problems since then.  I would delete and reload individual apps, but then the Apple App Store gods would act and lots of apps would go back to "Waiting..." state with no way I could find to get them out of it from my iPad.  I just synced all the Apps via iTunes on my computer and they are now all out of "Waiting..." state.  Hope it stays that way.

I also have now taken the advice of others here and saved my iPad backup from before I started this process in another location on my Windows computer.  It was not overwritten when I upgraded to iOS9 by asking to set up a new machine.  Guess I was lucky, and I would prefer to not test that again.

I too had this problem when upgrading an iPad4 on ios6. I restarted several times, re-updated it several times but to no avail. The only thing that worked was installing 8.4.1 on it (as suggested on page 1 of this thread).

The only issue I have now is that although iTunes was able to sync all my content it would not sync any apps over. In the apps section it says (on the relevant apps) "Will Install" but it doesn't, these buttons and the "Install" buttons are greyed out and so to is the "Automatically install new apps" check box. the only way to get the apps was via the App Store on the device one-by-one - although four apps are no longer on the store and I can't get them off my mac either. Other devices can install apps via iTunes but not the iPad4. I have still not actually upgraded it to ios9 at this time.

I don't know if this app issue is related to the "slide to unlock" issue or just coincidence.

UPDATE, I did this update two days ago and tried again yesterday to see if it would sync the missing apps with the iPad physically connected to the mac. I just now looked at the app section with the iPad connected via WIFI and non of it is greyed out. I'm now syncing via WIFI and it seems to be working.

Interesting... I detailed steps to fix the issue because APPLE FAILS YOU. And either a forum mod, or the poster, deleted it all.

Fancy that.

Sorry to have spoon fed directions that didn't involve sucking at the teat of of Apple and expecting them to release a new version that fixes everything and works like magic. Downloading an ipsw file or software to your phone is not illegal, fyi. Learning how to use your tech is to your betterment. Sorry some feel like holding back the community's knowledge at large.

Best of luck in repairing your device.

I can't believe Apple deleted the whole thread. I'm sure this message will be deleted too. But hopefully you get my "thank you for your help" before they do.

Hi Herrie, i speak english so so, i need your help, because my ipad stuck after ios9.2.1 update. This once used ios4. my email es nelsongarciap@icloud.com