OK I have got mine working now. BUT reset to factory settings.
You need to 4. Put your device into DFU mode. Search for "TUTORIAL - Failsafe method to restore the current version of IOS" on this site
Then it will restore.
So in summary.
# My iPad was working fine until Apple nagged me to update...
I am in same boat. Was working fine until I decided to update it. Now stuck in a Restore iPad loop.
Im assuming Ive lost my data and have a £1k Apple turd on my desk.