How to rollback windows 8 to previous 8.1?

Question

Backup

How to implement this without the installation disk?
What cmd command or utility can be used?
It was 8.1, I installed another copy of 8.1 from the disk. Need the first version (which was). Both licensed

Answer 1

Launch Settings from the panel on the right, then click on Change PC Settings at the bottom. Then Update and Recovery, and then in the menu on the right, select Recovery and indicate the type of recovery: Recovery
window

Answer 2

Let's tell fortunes on coffee grounds:
1) Milos Fry bought a laptop with Windows faces, let's say 8.1 for one language, I wanted to try the maximum wine 8.1, he demolished the previous one, but then he thought, damn it, there is a license ..... thought up to restore but does not know how - you take the image msdn with exactly the same name as the license, install and then search the internet for a utility that shows a wired key in the BIOS
2) previous 8.1 Milos Fry likes more than the one he installed - the answer to restore is nothing to look for the previous image