Disgaea show me a error message when loading

I downloaded Disgaea (U). When I try to run it in my DS with my DSTT card, it show me a error message and ask me to reset. I have downloaded other games here and all works perfectly but this one. I was expecting this game and is a down that I cant make it work. And I see in the coments that other people that download it here are playing it. :(. Ive done something wrong? or is a problem with the file?

I can play it just fine on an emulator. I don't think the file is bad.I'm not an expert when it comes to the Flash Cards for your actual DS, but the common answer here is "Upgrade your firmware".

Thanks ... that was it, now is working .... YEAH!!!!!!!!

i dont want to sound like an idiot but i got that same problem. how do u upgrade your firmware?

go tohttp://linfoxdomain.com/nintendo/ds/and download the firmware file. extract all files to micro sd and click replace