Q: My iPhone5 is stuck on "slide to upgrade " after installing iOS 9.0

This is what Apple is saying you should do:

If the Slide to Upgrade screen won't go away after you update to iOS 9 - Apple Support

Best of luck,

GB

Hi, I had the same problem, this worked but you'll lose your photos, contacts etc... But at least you'll have a phone you can use again!

Turn off the device, and launch iTunes on your computer. Connect the iPhone, iPad or iPod touch to the computer using a USB cable, and hold down Power and Home button for 10 seconds. Release the Power button and keep holding Home until a message in iTunes appears saying the device is in recovery mode. Device will recover but revert to factory settings again.

You can shut off Find My iPhone via iCloud.com. You would need to go to the Find My iPhone app on iCloud.com, click on the device, click on Erase, then remove it from the iCloud account. Once you have restored it, you can then turn on Find My iPhone again and it will link back up to the iCloud account.

Best of luck,

GB

Thank you so much, this helped tremendously.