Lumia 625, Windows 10 Technical Preview doesn't even boot, how can I get it to boot?

[Windows Central Question]

Lumia 625, Windows 10 Technical Preview doesn't even boot

Enrolled for technical preview and got Windows 10 preview downloaded. During install, I only see 2 wheels rotating for-ever. It's been more than 12 hours now...and I don't see any update. I couldn't provide any details regarding the preview version that should be installed...having a very very bad experience.

 

[zapppa83]

Re: Lumia 625, Windows 10 Technical Preview doesn't even boot

hold power button until reboot then it will finish the installation without problems