Now I'm just making a thought here, so don't lash out at me if I'm missing some obvious detail. Anyway, I was thinking; it's obvious why carts like the R4i RTS (the one I have personally) can't run 3DS backups; they're designed only for NDS games. However, I was thinking that it may be possible to load a .3DS file from a DS-Mode flashcart. The general idea is that you'd load up your MicroSD with your 3DS backups, and then using Tubehax or Ironhax (maybe even Ninjihax) you would load content from your Flashcart in 3DS mode. I'm no expert, but I don't think you need kernal access to direct memory to the game slot. Thoughts, confirmations, or proof against would be appreciated!