Unbricking the DS
It is easiest to recover a bricked DS if FlashMe was previously installed, so consider installing FlashMe as insurance against permanent bricking. If your DS has FlashMe installed, and you own a flash cart, you only need to reinstall FlashMe by following these steps:
Download FlashMe (http://ds.gcdev.com/dsfirmware/)
Put FlashMe on your flash cart by itself, without any loader. If your flash cart software mangles the header, you must prepend a loader (http://ds.gcdev.com/dsfirmware/ndsloader.bin) to the nds file. To do this:
Put flashme.nds and ndsloader.bin in "c:\flash"
Click Start->Run and type "cmd" if you are using Windows 2000 or XP, or type "command" if you are using Windows 95, 98 or ME
In the box that opens type "cd c:\flash"
Type "copy /b ndsloader.bin + flashme.nds flashme.nds.gba"
Flash flashme.nds.gba to your flash cart, by itself, without any other loaders
Put the flash cart in your DS
Hold down A+B+Start+Select and while still holding the buttons down turn on your DS
Run FlashMe as instructed on screen
If FlashMe was not previously installed there is still a way to recover. It involves a hardware hack and requires soldering skills. To repair the DS in this way, download (http://darkfader.net/ds/files/ppflash.zip) the parallel port flasher from DarkFader's site. Follow the instructions included in the zip.
>>> i dont own a ds but god you could have just googled it