NEWS SOURCE #1: Mugen.Souls.PS3-DUPLEX FIX 3.55 by Roid Clive ^_^!! (via) ps3sosAfter a couple of days doing experiments with European and Japanese versions, here you have the patch Hybrid Game "Mugen.Souls.PS3-DUPLEX" translated into English to 99.9% (only PS3 Trophies are in Japanese). Friends so enjoy ^ _ ^!.
Greetings from Sevilla."
NEWS SOURCE #2: mugen souls bles01723 fix eur (via) ps3iso
NEWS SOURCE #3: Mugen Souls PS3 3.55 / 3.41 CFW EBOOT Fix is Released (via) ps3news