At the moment seems a little bit hard to debug since the mms is impossible to download again and original raw message was overwritten during the following downloads...to debug the issue, add a timestamp to the message file would be better instead using .bak

So, until now i may suppose that first download went fine but decode failed forcing fmms to try again and again the download overwriting original raw message.

Concerning MMS-1.3, in october 2013 i received an mms of the same version without errors.