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Posts: 2,006 | Thanked: 3,351 times | Joined on Jun 2010 @ N900: Battery low. N950: torx 4 re-used once and fine; SIM port torn apart
#5
Quick reply.
I don't know a way to power off the device during reboot loop without taking the battery out. Though you could try pressing power key between volume and camera...

I would suggest.
Take battery out.
Wait 2-5 seconds.
Press down 'u'.
Plug in USB PC cable.
Wait 2-5 seconds.
Put the battery into the device.
Check that phone is in flashing mode ('Nokia' screen with USB symbol in top right corner).