Thanks for the reply.
However, following this guide I'm only able to do the seedminer+Steelhax method, and when I reach the step to get otherapp payload, I find the same problem: there's no 11.10.0-43E option, only up to 11.9.X...
Does it means the only way to do this is by buying a DSiWare title on the eShop?
Thanks for the help.