WE826 and MC7455 won't connect to eachother

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dustinbleh
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Joined: Thu Oct 10, 2019 9:42 pm

WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Fri Oct 11, 2019 1:09 am

Hello,

new here but some assistance would be much appreciated. Running out of hair trying to get this up and running.

Just bought a new We826-T2 from ltefix, as well as some upgraded antennas and a used MC7455 from eBay in new condition. IMEI is clean. Using Verizon prepaid unlimited plan with a Novatel T1114 previously and wanted an upgrade and some more functionality. Received the modem and LTE card today and assembled everything following the tutorial. When it didn't immediately work I started reading the forums and trying many fixes from here but none have worked, including hard rebooting the device, factory resetting the device, reflashing the firmware, removing the SIM card and cleaning it, removing the LTE card and reinstalling it.

Some of the problem seems to be that I cannot run AT commands. The card will occasionally show as connected with an unknown IMEI and unknown SIM ICCID, but then it immediately disconnects. It has never once connected to the internet since I assembled it.

This is what it says under device information:

Device Information
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 1, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 4.14
S: Manufacturer=Linux 4.14.63 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=101c0000.ehci
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#= 2 Spd=480 MxCh= 4
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=05e3 ProdID=0608 Rev=85.37
S: Product=USB2.0 Hub
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms
********************************************************************************************************
T: Bus=01 Lev=02 Prnt=02 Port=02 Cnt=01 Dev#= 7 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1199 ProdID=9070 Rev= 0.00
S: Manufacturer=Sierra Wireless, Incorporated
S: Product=Sierra Wireless MC7455 Qualcomm
S: SerialNumber=LQ71554385021020
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 2mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=qcserial
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
********************************************************************************************************
T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 1
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0001 Rev= 4.14
S: Manufacturer=Linux 4.14.63 ohci_hcd
S: Product=Generic Platform OHCI controller
S: SerialNumber=101c1000.ohci
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= 2 Ivl=255ms

And under AT Command Execution it says this, over and over again:

Thu Oct 10 22:55:25 2019 : /dev/ttyUSB1 Can't open device /dev/ttyUSB1.

Which I'm assuming is the LTE card. Sorry for my naivety but I am extremely new to this hardware and UI so I don't know what other information might be helpful.

I have sanded the corners on my sim cards to make sure that wasn't the issue, and have tried my unlimited hotspot sim, as well as my unlimited phone sim with zero success.

Any help would be greatly appreciated. Thanks for reading!

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JimHelms
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Re: WE826 and MC7455 won't connect to eachother

Post by JimHelms » Fri Oct 11, 2019 1:21 pm

The good part is your MC7455 modem is being detected.

But, it is having issues communicating with the MC7455. It is possible the modem is in the wrong composition to access the Modem WAN ports which is why you are not able to enter AT Commands.

Do you have a USB to Mini PCI-E adapter you can use behind a Windows machine?

dustinbleh
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Joined: Thu Oct 10, 2019 9:42 pm

Re: WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Fri Oct 11, 2019 3:41 pm

No, I don’t-but I will order one.

dustinbleh
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Re: WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Fri Oct 11, 2019 4:34 pm

Once I receive that, what are the next steps?

dustinbleh
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Joined: Thu Oct 10, 2019 9:42 pm

Re: WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Fri Oct 11, 2019 10:00 pm

I read the page about firmware on the mc7455. When I receive the USB adapter I’ll just try to flash the stock generic firmware.

dustinbleh
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Joined: Thu Oct 10, 2019 9:42 pm

Re: WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Tue Oct 15, 2019 2:59 pm

So I received the USB adapter today.

When I plug it into the computer, it constantly connects and disconnects over and over again.

When I send the ATI command using the Huawei tool, nothing is returned.

When I try to update the firmware, it says:

Device error code: 0x0 - Unknown device error code.

and does nothing further.

Does this mean I have a bad card?

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JimHelms
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Re: WE826 and MC7455 won't connect to eachother

Post by JimHelms » Tue Oct 15, 2019 3:07 pm

Did you first install the Sierra Wireless software drivers for Windows?

dustinbleh
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Re: WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Wed Oct 16, 2019 10:46 am

Yes, I installed the USB drivers and followed all of the steps show in the tutorial on this page:

https://ltefix.com/lte-fix-it-firmware- ... nd-em7455/

After following the steps, the card is shown in the Huawei Terminal window, but it will not connect and does not respond to the ATI command.

I am assuming it is a bad card. I requested a refund from the eBay seller and I ordered a new card from Amazon (the EM7455-with the proper adapter and pigtails). I ordered the EM7455 because it was about 1/4 the cost of the MC7455.

Guess we'll see how that goes.

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JimHelms
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Re: WE826 and MC7455 won't connect to eachother

Post by JimHelms » Wed Oct 16, 2019 11:57 am

What COM ports are showing up in the Huawei Terminal?

dustinbleh
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Re: WE826 and MC7455 won't connect to eachother

Post by dustinbleh » Thu Oct 17, 2019 12:34 pm

COM3

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