Hykem already said it's supported from 2 to 5.5.0so the exploit isn't blocked in 5.5? That's very good for me (and many others) then.
and since there are many developpersd on 5.5.0 (some who already have access to the private exploit), means 5.5.0 is probably the first one that will have it ported ^^. so yeah, just enjoy online with your family on 5.5.0 but make sure it doesn't go beyond that (in case nintendo releases a new firmware).