Updated my 3DS to firmware 8.1 to get a better mt card emunand but now when I go to the web browser with the launcher.dat (Gateway 3.0.4), it just tells me an error has occured, help?
MT card launcher only works with 4.X and the DS profile exploit.
Only GW and Sky3DS support newer firmwares ATM.
You can downgrade using the GW launcher even if you don't own a GW.
Delete data from the browser settings. That might help, it helped most people having problems launching the exploit. I haven't had any problems launching it myself though.