Flash Cart Obsolete

Now that my m3i zero old model is obsolete and won't run on 4.4.4 dsi software, has no current support,Should i sell my dsi? I can't afford $90 NZD for OLD ds games from ebgames and i bought this dsi cheap from a friend.

Why would you sell it? Just buy a new card that works on the DSi firmware.
I suggest the Supercard DSTwo or the R4i Gold 3DS.