I just downloaded FLSMS2.0.3 and launched it after my Huawei E1752 modem was already connected to my pc (COM11 according to my computer's Device Manager ).
Under Settings -> Phones & connections, I added the GSM modem and filled in the com port, the PIN for the SIM card, and the baud rate. (I don't know the IMSI or serial number but the help documentation says that these are not necessary).
FLSMS2.0.3 can't establish a connection. I get these errors. Any suggestions? Thanks!
Failed to create route on Huawei: connection.error.org.apache.camel.runtimecamelexception 
|COM10||huawei E1752 (unknown number)||UNKNOWN (?: SIM PIN OK)|
|COM11||huawei E1752 (unknown number)||UNKNOWN (?: SIM PIN OK)|
and once I got this:
|COM10||[unknown manufacturer] [unknown model] (unknown number)||UNKNOWN (^BOOT:32387796,0,0,0,26 AT+CGMI huawei OK AT+CGMM E1752 OK AT+CNUM +CME ERROR: SIM PIN required?: SIM PIN OK)|
|COM11||huawei E1752 (unknown number)||
UNKNOWN (?: SIM PIN OK)