if you have had an app say "cannot read data, turn off power and re-insert card", then i am going to help you fix it with arm7..
before i begin, i am doing this because after days of trying to figure it out myself, and got it, i had no help from anybody...so this is for that guy who has been on here for two hours trying to get a hint on how to fix it....so.... here we go....
you will need:

arm7 fix (Nowarez links - retro) this particular file will be more beneficial, i explain why in a sec...

after you have this downloaded, extracted and ready to go, open the file...
you will see three important things: DONOR, PATIENT and FIX (the dos file)
the reason the file i provided is important is because of the donor file....usually you would have to find a rom that will provide the fix, and not all roms work....the best one is simcity DS jap #0864 i believe.... well
the rom is already in this file i have provided...so its one less worry....any who....
if you have not guessed, you need to put the rom that is not running in the PATIENT folder....ok we are set....
with that done, now you need to run the FIX file...a DOS menu should pop up....
it will ask you if your ready (as if your about to fight a lion)....just type Y and hit enter....a bunch of code and files
should run through DOS and then it will stop....just give it a couple more seconds and it will close itself....
now, in the root of the fix folder should be a file named "fix.nds"....just rename it to its original name (ex. Drawn to Life.nds)....after that, put it on your card and boo-yah.....its done....and now you can do a little bit of this:
and if it blows up into a billion pieces, do a little of this:  :crazy: followed by this :  :'(

enjoy

EDIT: i just found out that not even the arm7 fix will make tony hawk's proving ground playable....and that will probably be the case for future games as well..sorry....

This post has been edited by retrohead, Wed, September 24th, 2008 at 14:08

Reason: moved forum