Same here.
My bad batch Acekard 2.1 worked fine after said firmware update I forgot but now is declared as clone after softreset.
Perhaps it has something to do the soft-reset combination differences?
Simple.
During the intro movie, repeatedly open and close the DS lid.
This freeze occurs due to overload in memory so closing the DS helps keep a stable flow.
Try it.
OMG I WAZ DWNLODING MAH ROMS AND I EXTRACTED IT.
IT WAS ALL LIEK: F4NIAL F4NTAZY FOR.ND5
I PUT IT ON MY uSD CARD AND THAT I MAH ACECARD.
BUT IT NO WORK.
DIDN'T DEBUG CUZ 2 HARD!!!
I NEED NEW FIREWAREZ!!!