Yes and no, the video show you the way to install palantine cfw but you don't want that yes ? The files in the pack (pbt cfw) are nearly the sames but it run on sysnand not emunand.
So you don't have to :
- downgrade (you already are on 4.5 no ?)
- set up emunand.
The rest should be the same.
Quickly, you must :
- put the content of the folder :
PBT STUFF.zip/PBT CFW/SDcard Files/ on the root of your sd card.
- go to this url with your 3ds browser to install the mset loader
- try to launch with the mset (you may see : up screen blue, white flash on second screen, then reboot).
- follow the video to install the devmenu (same as palantine cfw)
- once you have the devmenu (or else) you can install sdf to restore your save and launch pasta.