(Sorry if this isn't the right place to post this...)
I was using the cartridge dumping feature with a DS cartridge for Dragon Quest IX, and ended up accidentally selecting "Dump Cart to CIA". I got the error message saying NTR/TWL carts can't be dumped to CIA, but after rebooting the console, the DS game will not boot. Instead, all that appears is a white screen. I can use the home or power buttons to get out of that, but I can't seem to launch the game. I confirmed that other carts do work, so I do not know if I somehow broke the cart. Apologies for the long post or if I'm missing something obvious.
EDIT: If I dump the cartridge to a .nds file and run it on an emulator on a computer, it appears to work just fine.