Colibri T20 + Iris Carrier Board + USB ACM CDC(for USB GSM Modem)

I am trying to connect to internet via Quectel GSB Modem. Have install driver received from Quectel by copying to the folder /FlashDisk/System.
The MODEM is recognized and does not prompt again and again for driver. But, the COM port connecting fails and does not show all the COM ports. Is something missing in the following registry settings?

;EC25 
[HKEY_LOCAL_MACHINE\Drivers\USB\LoadClients\11388_293\Default\Default\USBCOM_EC25_Class] 	
"Dll"="qlusbser.dll" 
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class]
"EnablePowerManager"=dword:0   ;disable
"TimeoutIdle"=dword:3A98    ;15s 
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class\MultiInterface2]
"Prefix"="COM"
"Dll"="qlusbser.dll"
"Index"=dword:8
"DeviceArrayIndex"=dword:1
"Priority256"=dword:65
"RxBufferSize"=dword:2000
"FriendlyName"="USB AT Port"
"IClass"="{CC5195AC-BA49-48a0-BE17-DF6D1B0173DD}"
"DeviceClassType"=dword:1
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class\MultiInterface3]
"Prefix"="COM"
"Dll"="qlusbser.dll"
"Index"=dword:9
"DeviceArrayIndex"=dword:1
"Priority256"=dword:65
"RxBufferSize"=dword:40000
"FriendlyName"="USB Modem"
"IClass"="{CC5195AC-BA49-48a0-BE17-DF6D1B0173DD}"
"DeviceClassType"=dword:2
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class\MultiInterface3\Unimodem] 
"Tsp"="Unimodem.dll" 
"FriendlyName"="USB Modem" 
"DeviceType"=dword:1 
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class\MultiInterface3\Unimodem\Init]
"1"="AT<cr>"
"2"="ATE0V1&C1&D2<cr 
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class\MultiInterface3\Unimodem\Settings]
"Prefix"="AT"
"Terminator"="<cr>"
"DialPrefix"="D"
"DialSuffix"=";"
"Pulse"="P"
"Tone"="T"
"Blind_Off"="X4"
"Blind_On"="X3"
"CallSetupFailTimeout"="ATS7=<#><cr>"
"Reset"="AT<cr>"    
"EscapeDelay"=dword:3E8
"EscapeWait"=dword:3E8 
[HKEY_LOCAL_MACHINE\Drivers\USB\ClientDrivers\USBCOM_EC25_Class\MultiInterface4]
"DeviceClassType"=dword:0