My pen (huawei E1550) is recognized as a cd rom on my computer (windows 7 64bits).
@ putty used command ATZ before ATI and then the AT^U2DIAG=0.
After configuring the right APN and a couple of reboots, its working perfectly.
Thanks everyone who put effort into this. Love you guys.
Edited by Pride1922, 10 July 2011 - 02:31 PM.