[felipe.ferri]

Hi folks,

I have a Huawei E3272s-506 USB modem. When I connect it to my Asus RT-N13UB1, it gets recognized only as a memory stick. The vendor and product ids are 12d1:157c.

Neither the model or the ids are present on the modem compatibility list in the Modible Broadband wiki page (though there are really close options, such as E3272s-156, or 12d1:157d).

How can I make my modem work with my router?
I posted this question originally on the Ralink SoC forum, but LOM pointed me to the Mobile Broadband wiki where it is suggested that I post on the developers forum, including the vid, pid and interfaces list.

I don't know what is exactly the interfaces list, but the response to the command cat /proc/bus/usb/devices is:

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 3.02
S: Manufacturer=Linux 3.2.38-svn20641 dwc_otg_hcd
S: Product=DWC OTG Controller
S: SerialNumber=lm0
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 11 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=ff MxPS=64 #Cfgs= 2
P: Vendor=12d1 ProdID=157c Rev= 1.02
S: Manufacturer=HUAWEI Technology
S: Product=HUAWEI Mobile
S: SerialNumber=FFFFFFFFFFFFFFFF
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
C: #Ifs= 3 Cfg#= 2 Atr=a0 MxPwr=500mA
A: FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=0e Prot=00
I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=0e Prot=00 Driver=
E: Ad=82(I) Atr=03(Int.) MxPS= 64 Ivl=2ms
I: If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=02 Driver=
I: If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=
E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=4ms
I: If#= 2 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

[LOM]

E3272s-503 is a new device and currently not supported in dd-wrt, it is a dual-role device which is compatible with new Windows 8 specifications as well as compatible with older Windows versions.

12d1:157c is the Windows 8 mode, a mode that dd-wrt is going to support in the future but the device can also be switched into "old Windows compatibility mode".
I don't have any info about usb id or interface layout in that mode, can you please test by running the following cmd:

usb_modeswitch -v 12d1 -p 157c -I -W -M 55534243123456780000000000000011062000000101000100000000000000

this should switch the dongle to "compatibility mode" and it will remain there until you unplug the dongle.
Please give me the the output of cat /proc/bus/usb/devices when the dongle is in "compatibility mode"

[felipe.ferri]

Hi LOM,

Thanks for your explanation. I was thinking that maybe the pen drive is locked to the 3G provider, but it is more likely that the compatibility mode is to blame.

Below are the results of the code you told me to execute. Unfortunately, the modem didn't work with the router after executing the mode switch.

[LOM]

Hmm, that was not the result I had expected.
It looks like the dongle switched but then fell back to initial mode again.

Can you do the same test again with usbstorage enabled in dd-wrt setting for usb.
Do also set WAN to anything else than "Mobile Broadband" to make sure that the manual switching does not interfere with the automatic switching which you get when "Mobile Broadband" is selected.

[felipe.ferri]

Dear LOM,

Thank you very much for your support. Unfortunately, as it was very important requirement that the modem worked on my router, I ended up returning it to the phone company, as I had a 7 day return period.

I was amazed at the fast response time and the commitment you showed in trying to solve the problem. I really can't thank you enough.

[eddie4]

[Wstyle]

Initially I could not get the Huawei E3276s-506 unit to connect to LTE on AT&T network, could only get to connect CDMA
Now I am not able to get the unit to connect at all.

Do you know how to update the firmware?