Huawei E398 not working out of the Box on MR3420

[Himan2]

The Huawei-Stick E398 ID: 12d1/1505 is not working "out of the Box" on the actual Image SVN 19234 on a TP-LINK MR3420 V1.2

I checked with normal-Mode (CD-Drives enabled) and with disabled Drives. Modeswitch ist not working, eighter.

here are the Driver-Info:

with enabled Drives: (Stock-Stick)
(AT^SETPORT="A1,A2;1,2,3,7,A1,A2")

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=12d1 ProdID=1505 Rev= 0.00
S:  Manufacturer=Huawei Technologies
S:  Product=HUAWEI Mobile
C:* #Ifs= 2 Cfg#= 1 Atr=c0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usbfs
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

 1046 root      1276 S    /bin/sh -c usb_modeswitch -v 0x12d1 -p 0x1505 -M 55534243123456780000000000000011062000000100000000000000000000
 1050 root      1008 S    usb_modeswitch -v 0x12d1 -p 0x1505 -M 55534243123456780000000000000011062000000100000000000000000000

and the Version with disabled Drives:
(AT^SETPORT="A1;1,2,3,7")

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=12d1 ProdID=1505 Rev= 0.00
S:  Manufacturer=Huawei Technologies
S:  Product=HUAWEI Mobile
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usbfs
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

[LOM]

12d1:1505 is supported since a few months back - there is something missing in this build if the stick doesn't switch mode

[LOM]

in r19425