hi. I've had a Rainbow Mod 1.3 installed some time ago. In general it was working pretty fine except: I couldn't configure MMS messages (the problem is very common for Lumias, can be fixed by installing and using the Network Setup app but I failed to install v1.6.0.0 from 4pda (doe to some error) and it is absent in Marketplace). This was critical for me and I decided to update. Moreover the newer core was released but Tolik (RM author) wasn't ready with new update to RainbowMod so I decided to try the Lumiatrix7_v4.1. The update was fast and successful. I had to re-link all my contacts with the facebook and linked-in contact list again (btw, does smb. know how to avoid that?) and reinstall some of the apps. People are saying about better operational speed... being hornest I didn't notice that. I am missing some useful tools in Lumiatrix e.g. ActiveSync, Operation list linked to the Search button BUT I have managed to get my MMS working now! So I am kinda happy :laugh: