Update went smooth and now my OS version is 8.0.10517.150, firmware revision number is 3051.40000.1352.0042 but now I can't launch:
App Folder
euronews
Here Maps
I'm here
Online-Translator.com
Skype - uninstalled and reinstalled, but no avail. Still takes forever loading and fails.
SoundHound
Waze
Games (not each of them have been tested):
2020: My Country - lost all the progress, damn it
Dredd vs Zombies
All these apps and games were uninstalled and reinstalled, but it didn't help
Extras+Info - I don't know how can I uninstall it
It might be my subjective feeling, but installing apps takes slightly more time
I'll keep you informed, if I find any solution or explanation
//edit
Weird thing is that I just downloaded and installed SIMS FreePlay and it doesn't load and launch too.
Will wait another day if anybody will come up with any idea and then Hard Reset is the only solution (if you may call it a solution)
///update
Hard Reset didn't help