N5 problems ?

I recently had problems with a game loading on my n5 card, so downloaded the v1.3, formatted card and started again with new firmware, but now all of games recognised on the ds but some get stuck on 2 white screens? ???

Those would just be common incompatibilities. What games are they specifically? You could look at ARM7 patching for a method.

Grand theft auto Chinatown Wars (e) works
Peggle Dual shot (u) doesnt
Professor Layton 1 (e) doesn't
Wolverine (U) doesntAll worked perfectley on old firmware? Fairly new at this not really sure what u mean by patching?

Explained here https://www.romulation.org/forum/index.php?topic=1462.0 Try reverting back to old firmware then.