EDIT : once again i suffer of same problem
i am running 4.1.0 , i already play using XCI like a charm , eg Crash Bandicoot and so now Mario Tennis then i have installed NSP version of this game using SX OS 1.4 but game ask me firmware upgrade , does it expected ?
More generally i have almost same experience : unable to play most of the NSP as i am prompted to update firmware despite stock cartridge don't require it , is it because i installed them using SX OS ?
What i am missing ? that makes me nuts ...