Here is a page about flashing your DSIt's been a while since i've done it, but Essentially, here is what you do.
1) plug an original DS game into the passme device
2) plug device into the DS
3) place flashme software onto your slot-2 flash card
4) place slot-2 card into DS.
5) Plug in DS to power outlet
6) Remove back of ds
7) boot DS

Boot flashme software
9) Place small metal object into hole in back compartment to bridge a connection to allow flashing.
10) screen will prompt you when its done
11) reboot without flashme software on slot -2 device
12) you can now run homebrew \ emulators \ backups from slot 2 device without the passme device.