This new version of FlashMe is now compatible with Mario Kart DS. Incase you are unaware of what FlashMe is - it is an alternative firmware for your Nintendo DS. Currently it is a hacked version of original firmware
Version: NDS-FW-V5.

The button combination A+B+X+Y, gamecode "PASS" or title "DSBooter" on the GBA cartridge automatically starts program from GBA cartridge (starting from offset 0xC0).
Most applications (like FlashMe) that were packaged with a newer ndstool already have a built-in nds loader, removing the need to prepend an auxillary nds loader to make it compatible with the FlashMe/PassMe boot method.
Fail-safe feature: The first part of firmware is write-protected with the SL1 contact. In case malware erases the rest, you can still reinstall FlashMe from GBA cartridge by holding START+SELECT+A+B keys.
Backlight fades in at startup.
Effectively removes the health screen, making it less annoying to boot.
Remove RSA signature check for Wireless MultiBooting (WMB) homebrew NDS files.