Aqua Blue and Flame red 3ds have a really high chance for frimware under 4.5 as they where stopped by manufacturer in 2012 (Japan and Usa) and the 5.0 firmware was released 2013 .
i don't know about the white 3ds sorry , also i can give you a site that sells 3ds xls with 4.4 firmware .
Can anyone Confirm if Luigis manison dark moon (Usa Version) will update my 3ds to 4.5 ?
(Sorry if it was answered i heard its only the European version of the game has that 4.5 update)