[Q] Help! Downgrading from JB 4.1.2 to stock ICS

Hi,

Please if somebody can help me sort this mess out.

I've flashed my note from stock ICS to JB (from telcel mexico) 2 days ago. it was pretty smooth and i liked it so much. but then i noticed that this rom had caused my network to be locked and i cant even connect to my network. i can just use wifi to stay online. so today i sent my phone to the store hoping that they can unlock it or make the 'lock' goes away. but unfortunately they cant. they asked me to downgrade it back to ICS.

so i've downloaded the stock ics from here;
http://forum.xda-developers.com/show....php?t=1424997

and flashed it using pc odin. but it stucked at the samsung logo. so right now what should i do? i heard that i cant wipe the data or factory reset since i have flashed the stock ICS. i dont want my note to go brick :crying:

somebody please please please helpppp

thanks