why dont most games work on my ds

??? for some reason i have done everything on the ds right but when i bring the games on to it only some work, please help or is it because some of them defo don't work.

I presume you're using a flashcart. Which?

what is a flash cart, rs4

I'm assuming that's R4
so... check that out
https://www.romulation.org/forum/index.php/topic,816.0.htmland this should be in the techinical help i guess

If you can't run them, check the common issues. https://www.romulation.org/forum/index.php/topic,1462.0.html

The flashcart is a device you use to play pirated games for NDS, i.e. R4, M3, Supercard, CycloDS, etc.