Not to burst your bubble or anything, but 6.x MSET support was added to rxTools 3.0b5, fully working, through firmlaunchhax already. It's O3DS only so far, sure, but it proves it's totally possible. Of course, CakesFW is the origin of the 6.x ROP chain, so not exclusive to rxTools. Either way, it means it's completely possible to port it to the N3DS as well, however unnecessary. And for the record, on N3DS as well, even the Gateway 4.x MSET uses a firmlaunchhax ROP chain. Gateway even forgot to obfuscate their initial ROP chain for it, so it's mostly there already. Else, I've personally found the 6.x MSET more stable than the 4.x variant, with more consistent boots. Perhaps it is superior to 4.x ultimately, but who knows. Definitely safer for the 2DS though, that's for sure.