IPhone 5 recovery mode freezes on and on

Sorry for the big story, but it is a big problem:
While installing iOS8 my iPhone 5 froze (plugged in directly in MacMini).
I tried a lot, but nothing worked.
I decided to restore the iPhone. Here's where it got realy bad.
iTunes version 11.4 (18) starts unpacking the software; prepares iPhone for restore; the Apple logo appears on the iPhone and the progression bar, but than nothing. iTunes shows: Waiting for iPhone. Once I even waited for 14 hours, but nothing.
So I unplug the iPhone and iTunes shows: "The iPhone [device name] could not be restored. An unknown error occurred [9]." Number 9 might have to do with security settings (but why would it show this when I unplug?). Turned of the firewall in OSX 10.9.5, problem not solved. After unplugging, the same display is shown on the iPhone (so no 'connect to iTunes' logo). It just stays like that for ages.
When I press the home and off button together for 10 seconds the screen goes black. After that it does not react to turning it on or off.
So replugging the phone, iTunes shows this message: "iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes."
I press o.k. and 'restore iPhone', and the whole process repeats itself.
What did I try so far:
Rebooting iTunes, reboot OSX, DFU mode, change USB port, restoring with and without SIM-card, using TinyUmbrella (did not work, changed original setting back), Redsn0w (did not work because Recovery fix does not support iPhone 5)
After 2 days I'm getting rather hopeless.
Who has the right solution?

I am having the exact same problem. After resetting my iPhone 5 with iOS8, I was restoring from a backup and it went into this mode and won't come out. I have tried everything.

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