wow i was just goin to awnser you, but this has to wait some more minutes, i just had the craziest crash on my mozart!
battery almost empty
i hook it up on my pc, zune starts everything is fine...
one or two minutes later, the mozart made a "PLOP" sound
it normally does it when you turn off the screen (maybe it didnt always do it)
but i heard the sound once or twice (or more)
but its not normal that the sound comes that late.
well. ZUNE said when this happend: Cant Connect to your Phone, please check connection (after sync)
The RED LED Light is still ON, but i cant connect my phone to Zune
Windows makes the USB Sound, mozart wont react,
i cant turn the screen on!
i cant not even turn it off!
only the RED LED is always On
OH MY LORD WHAT HAVE I DONE!?!?!
im goin to pull the battery and see wtf is happending....
btw sorry to highjack your post
/edit
PFEW lucky me battery plug fixxed it,
i wonder wtf this was! scared the hell out of me..
now to your problem, its really simple and a little surfing the forum would have helped you, maybe searching is always a good idea, but here we go:
Depending on you Carrier you can flash back any Carrier Branded rom
without Goldcard, if u want to use another carriers rom or a unbranded one youll need a goldcard, sdcard(usbreader) & Y-Cable
so if you on T-Mobile DE you get from here:
http://forum.xda-developers.com/forumdisplay.php?f=786
[NoDo ROM]Mozart_TMO_DE_1.30.401.01_Radio_5.54.09.21_22.33b. 50U_NoDo, by ansar
this rom for nodo
[ROM]RUU_Mozart_TMO_DE_1.25.111.05_5.50.09.18_22.24.50_ RELEASE
this is 7004 (RTM i belive)
or
[ROM]RUU_Mozart_TMO_DE_1.28.111.03_5.52.09.16_22.33a.50 _RELEASE
which may be the feb update 7008 (pre-nodo)
inside there you should find all other nessesary information