Why android has stopped upgrading?

[AC Question]

I've galaxy alpha, it started upgrading 1 from 210 and when came to 173 from 210 it stopped. I can't turn off or turn on my phone, what's happening?
Then I took out battery but it doesn't work, phone started upgrading and again stopped to 173
I' very disappointed.

 

[Naveen Kumar M A]

Backup and reset our phone, It will do update.