R4 and M3

Simple and idiot question.... what is the difference btw them??? i only got R4 and cant play alot of roms!

A simple solder difference in the circuits.

thx for reply but why is it that R4 cant play alot of roms?(my experience)...seek help

Old flashcart.

R4 - the team that did the software are gone - so no more official updates, therefore the newer games will get more problematic. Unofficial software is available to increase compatability.M3 well supported card, at the moment working 100% - a recommended upgrade

is it possible to upgrade it online for free? thx for help...

upgrade from R4 to M3? No, its a physical hardware difference.