We've now fixed the issues with RTS and
cheat codes and a new BETA will be following shortly. We've also revisited "Daigasso! Band Brothers DX" and this time have properly fixed support for the new save type. However, there is some bad news: it seems that each retail cart is shipped with a unique identifier pre-programmed, and this identifier appears to be checked by the server when you attempt to use WiFi to download songs. Unless a valid identifier is presented, the server will not allow you to download any songs (but it does let you preview them).
This seems to be a new form of copy protection, which takes advantage of the fact that you need to connect to an external server in order to use the game to its full potential. I wouldn't be suprised if an increasing number of WiFi enabled games used a similar form of protection from now on, as this is probably the most effective way for Nintendo to combat piracy at this point in time. So it looks like if you want to download songs, you're going to need to use the original cart (which you guys all have anyway, right? ).
FYI - we were able to successfully download songs over WiFi while the game was running on CycloDS Evolution but ONLY AFTER we had dumped the flash memory from an original cart (containing the unique identifier) and used this as the .sav file.