How to downgrade win10 to win 8.1!!!

Hi guyz,
I bought iball i701 windows tablet. It came with win 8.1. But I updated it to win 10. It got strucked and touch is not working properly. Its too laggy. If I touch in one place, it reflects in somewhere. Kindly suggest me how to downgrade it to win 8.1.

http://www.thewindowsclub.com/rollback-from-windows-10

Try this...
but I hate windows...

Microsoft is very smartly using its billions of customers as free Beta Testers .....

Yes, right! I am also agree with you. Microsoft is doing a great job so far for the users.

But I don't have any rollback options in settings...

By any change did you have Ghost copy / Recovery back up / Window 8 key?
If you have, Do it old fashion way of formatting and re-installing the windows!

There is some limited period of time in which you can revert back to win 8. I think 1-2 months.

w w w. cnet .c o m/how-to/windows-10-how-to-roll-back/

just follow the steps mentioned

settings==>Update & security ==> recovery ==> go back to windows 8.1