Cant run Guitar hero Decades/modern hits :(

Well, i downloaded the games, tried running them on my DS but the "Save data could not be accesed.. reinsert.." error comes. I tried the arm7 thing but the screens turn white. By the way, i have the original hand grip.
Please, how can i fix this?

What flashcart are you using? Do you have the latest firmware? Check at http://www.linfoxdomain.com/ds/

I have an original R4.

Do you have the latest firmware? If 1.18, try ARM7 patching, using the file from another ROM. If that doesn't work, try looking at YSMenu, an alternative firmware.

hm.. well in my first post i said i already tried the arm7 thing.. and i habe the 1.18, i already tried the 1.19 but i dont feel like trusting it, i feel like if i use that YSMenu its going to do something bad to my R4 and my DS, both are pretty new so.. i feel im gonna damage them in some way :( im very insecure about it.

Yes, but trying again with another ARM7 file sometimes helps. YSMenu is a trusted firmware. I use it :) It all depends on whether you want to use it or not.

so.. please, tell me everything i should know about the YSMenu >.< please!! I have the DSLazy and the arm7 that comes with it, its the only one i ever used.. is there anothers?

http://gbatemp.net/index.php?showtopic=164359