Downgrading is only possible as of now in 10.3 firmware. N patched the exploit in10.4 so downgrading is out of option.
As for you next cart, one R4i Gold 3DS RTS made by r4ids.cn or a Supercard DSTWO/+ from eng.supercard.sc
As for you next cart, one R4i Gold 3DS RTS made by r4ids.cn or a Supercard DSTWO/+ from eng.supercard.sc