Hello.
Your Issues sounds like the same I have actual:
https://gbatemp.net/threads/please-reconsider-it-good-to-install-unlaunch.567933/
As Advise I got from @susi91 to keep the Cables as short as possible.
I also think it depends on the SD Adapter too....
Unfortunately I did not managed it until today,I have to try it again this Summer........hopefully...
Good Luck
Thank you.
I recently finished installing a hardmod on my DSi XL and everything is wired correctly according to the diagram on this thread, however when I plug the system into the computer using the SD adapter cable and SD reader, it doesn't seem to mount on any drive. Turning on the DSi with the adapter plugged in gives me a completely blank screen with no error messages akin to the 3DS hardmods and the system turns on and functions normally without the adapter plugged in. I'm running Hiya CFW and I have Unlaunch installed on my NAND if that's a factor. This is also my first time doing a NAND mod on anything so I'm rather lost. Help would be greatly appreciated.
Your Issues sounds like the same I have actual:
https://gbatemp.net/threads/please-reconsider-it-good-to-install-unlaunch.567933/
As Advise I got from @susi91 to keep the Cables as short as possible.
I also think it depends on the SD Adapter too....
Unfortunately I did not managed it until today,I have to try it again this Summer........hopefully...
Good Luck
Thank you.