EDIT: v1.21 may not be made by the original R4 team but it has been proved to work on genuine R4 cards. It's a bit buggy but cheats work better.
I thought it was the other way around, YSMenu got all the cheats working and this new unofficial firmware didn't, I could be wrong but I believe it was this way.
The only reason to get this firmware is because one game, Star Wars Jedi something, does work with this firmware. Or if you think R4YSAuto is to hard to work with (to which I disagree since it's peanuts to get it to work), then you could get this firmware instead. Otherwise just get YSMenu, it's the best firmware for the R4 at the moment.
Maybe the M3 Team will make firmware that's backwards compatible with old R4 since they took over and started developing new R4s, but this still isn't confirmed yet, I believe.
QUOTE(fgghjjkll @ Jun 29 2009, 08:45 AM) no. best solution. buy new cart