[Neeraj Maheshwari]

This is purely out of my personal experience. Not a question, but a caution!
No matter for how much time cogs keep on spinning, even if the progress bar reaches the end, DO NOT try to restart the phone by yourself. I was tempted to do the same when progress bar reached the end and stayed there for almost 20 mins. But I kept my patience on L1020.
The result is it restarted normally.

In an Earlier installation, I thought it was frozen, and on restarting, I was greeted with :-(

I hope this will keep you away from using Recovery tool. :-)

[HXD]

Captain Obvious. :D

[mjyumping]

Stuck on cogs always happen to me, and I always remove sd card during the cogs and restart manually, but works fine!

[Praxius1]

I got the death face on my 930 a few times, rolled back to 8.1 each time and started again a few more times before I figured it out.

Problem for me was that I am also testing on a 625, 630 and sometimes on a 1320 & 925 which all went through the cogs in a few minutes. My 930 was going for a much longer time and therefore seemed like it was already stuck so restarting couldn't make it anymore worse.

...... But yes, it sure can :P