How to downgrade to iOS 4.1 on a 3GS

This video was a request and a general idea to show people how to downgrade the 3GS to iOS 4.1 and to avoid the 1015 Restore error.
Links used In this video
Recboot-
Restore ipsw- https://ipsw.me/iPhone2,1
Please comment what you want to see next and if I can do it i’ll make it happen.