Hello, I bought a 3DS XL Mario Kart 7 bundle and it came with 126.96.36.199u. I also bought a Gateway to play my backups. I successfully modded it to extract my 4.3 NAND and this way I could upgrade to 6.3 and play with eShop, Pokemon X Y, etc. I'm planning on buying a DSTwo to enjoy some homebrews. Since I intend on sticking to the 4.3 FW (because of the GW flash card), is this safe to upgrade my DSTwo to 1.23 FW? Is this DSTwo FW compatible with 3DS 4.3 FW? Plus, if so, how should I upgrade my DSTwo? Thanks a bunch!