Black2 won't show up in homebrew save manager

[Atomsk27]

I've been using homebrew save manager and pkhex with no problems on the newer Pokemon games, but the Black 2 cartridge won't show up. I did a search and some one says it works fine with a r4i dongle, but that thread was really old. I was just wondering if there is a easier way to get my black 2 save off the cartridge, without having to buy extra stuff? Thanks.