Hi that guide is horribly out of date at this point in time. As long as it has an exploitable serial number (check
HERE or
HERE) then it is exploitable by fusee gelee.
From there there are 3 CFW's available which drax mentioned a few posts
up.
I also recommend doing a
nand backup using hekate before cfw if it is hackable with fusee
Additionally after it is hacked and you want to connect online for FTP or online play using xlink or lanplay then I recommend running
90DNS which blocks connection to nintendos servers.
It is recommended that before you do use 90dns that you run the included tester included in the optional steps to make sure it isn't hijacked by your ISP.
If you need any more help then feel free to message here again and someone will help you out