Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

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JamesReinhold
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Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JamesReinhold » Sun Jan 13, 2019 2:48 pm

Hello - I've exhausted the tutorials and troubleshooting guides over the past several days and need some guidance please.

The BLUF is that I can't seem to connect to LTE, I can only connect to WCDMA. In my last attempt - I packed everything in the car and drove "to town" thinking signal was the issue. No change. I've based my coverage assumptions from the map that RootMetrics publishes and there is AT&T LTE coverage in my area (22942).

Equipment: New WG3526 and MC7455 (from LTE FIX)
Antennae: Eightwood 2pcs 5dbi 3G 4G LTE Antenna SMA Plug Male Omni- Directional (From Amazon)
Firmware: WIFIX GoldenOrb (openwrt-wg3526-GO2018-09-02-upgrade)
SIM: AT&T PrePaid, purchased through Amazon, activated by NetBuddy.co

I started out with the tutorial WG3526 - Building a MC7455 CAT6 LTE Router and was not successful in connecting. I followed this up with the MC7455 and ROOTer - Troubleshooting Connection Issues and am still no luck. I've combed through the forums and feel like I've tried everything possibly related in the other posts.

One of the things that I've noted is that through all of my attempts - I don't get the impression that the SIM is registering properly with AT&T. I did ask Netbuddy to confirm that they activated it, and they replied that it was - but I wonder, not having any experience with it or any other way to verify the SIM works.

So status where I'm at:
- Performed reset and reprogram of MC7455

Code: Select all

at!entercnd="A710"
AT!RMARESET=1
at!reset
Hard re-boot, Followed by

Code: Select all

at!entercnd="A710"
at!usbcomp=1,1,1009
at!custom="IPV6ENABLE",1
at+cfun=1
at!selrat=06
at+cgdcont=1,"ipv4v6","broadband"
at!reset
Hard re-boot, insert SIM - no dice.

Reset Router Firmware and re-enter APN to "broadband"; still no luck. Here's the info that I've pulled using the various AT commands in hope someone with more experience might be able to point me in the right direction:

Code: Select all

AT!GSTATUS?
!GSTATUS: 
Current Time:  195		Temperature: 37
Reset Counter: 1		Mode:        ONLINE         
System mode:   WCDMA      	PS state:    Not attached 
WCDMA band:    WCDMA 850  
WCDMA channel: 1007
GMM (PS) state:DEREGISTERED   	LIMITED SERVICE
MM (CS) state: IDLE           	NORMAL SERVICE 

WCDMA L1 state:L1M_PCH_SLEEP  	LAC:         2AEC (10988)
RRC state:   DISCONNECTED   	Cell ID:     0B9183BB (194085819)
RxM RSSI C0:   -93		RxD RSSI C0:  --- 
RxM RSSI C1:    --- 		RxD RSSI C1:  --- 


OK

AT+COPS?
+COPS: 0,0,"AT&T",2

OK

AT!LTEINFO
!LTEINFO: 
Not Available


OK

AT+CPIN?
+CPIN: READY

OK

AT+CNUM
OK

at!usbcomp?
Config Index: 1
Config Type:  1 (Generic)
Interface bitmask: 00001009 (diag,modem,mbim) 

OK

at!gobiimpref?
!GOBIIMPREF: 
 preferred fw version:    02.24.05.06
 preferred carrier name:  GENERIC
 preferred config name:   GENERIC_002.026_000
 current fw version:      02.24.05.06
 current carrier name:    GENERIC
 current config name:     GENERIC_002.026_000

OK
Thanks in advance for any assistance.

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JimHelms
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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JimHelms » Sun Jan 13, 2019 3:44 pm

First, pull power and install the OEM 4G antennas on the router.

Then, power up and run the AT!GSTATUS? one more time.

I agree it does appear your SIM Card is not activated.

But, the modem also appears to not be receiving a signal.

JamesReinhold
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Joined: Wed Jan 02, 2019 11:46 am

Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JamesReinhold » Sun Jan 13, 2019 3:51 pm

Hi Jim -

Powered down (removed power) and installed the OEM antennae. Here's the results:

Code: Select all

AT!GSTATUS?
!GSTATUS: 
Current Time:  198		Temperature: 36
Reset Counter: 1		Mode:        ONLINE         
System mode:   WCDMA      	PS state:    Not attached 
WCDMA band:    WCDMA 850  
WCDMA channel: 1007
GMM (PS) state:DEREGISTERED   	LIMITED SERVICE
MM (CS) state: IDLE           	NORMAL SERVICE 

WCDMA L1 state:L1M_PCH_SLEEP  	LAC:         2AEC (10988)
RRC state:   DISCONNECTED   	Cell ID:     0B9183BB (194085819)
RxM RSSI C0:   -87		RxD RSSI C0:  --- 
RxM RSSI C1:    --- 		RxD RSSI C1:  --- 


OK

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JimHelms
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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JimHelms » Sun Jan 13, 2019 4:56 pm

And, you are sure the U.FL connectors are correctly installed on the MC7455 MAIN and AUX antenna ports? And, not mistakenly installed on the GPS antenna port.

If so, the next thing I would try is to reset the modem one more time:

Code: Select all

at!entercnd="A710"
AT!RMARESET=1
at!reset
When the modem comes back online, it will be in QMI mode which is okay for the newer kernel firmware builds.

Make sure the APN is set in the MODEM > CONNECTION PROFILE > APN > broadband

Do a hard reboot.

And run the AT!GSTATUS? one more time.

JamesReinhold
Posts: 6
Joined: Wed Jan 02, 2019 11:46 am

Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JamesReinhold » Sun Jan 13, 2019 5:14 pm

Hi Jim. U.FL connectors are correctly installed - I've checked them a couple of times just to make sure they didn't pop off putting the case back together.

I did a reset of the modem:

Code: Select all

at!entercnd="A710"
OK

AT!RMARESET=1
!RMARESET: DEVICE REBOOT REQUIRED

Items Restored:  2153
Items Deleted:   27
Items Skipped:   5

OK

at!reset
OK
Followed by a hard re-boot. Verified APN under Modem -> Connection Profile is "broadband" and pulled status and additional info from Modem -> Debug Information as requested:

Code: Select all

Mon Jul 30 19:36:41 2018 : /dev/ttyUSB2 AT!GSTATUS?
!GSTATUS: 
Current Time:  215		Temperature: 37
Reset Counter: 1		Mode:        ONLINE         
System mode:   WCDMA      	PS state:    Not attached 
WCDMA band:    WCDMA 850  
WCDMA channel: 1007
GMM (PS) state:DEREGISTERED   	LIMITED SERVICE
MM (CS) state: IDLE           	NORMAL SERVICE 
WCDMA L1 state:L1M_PCH_SLEEP  	LAC:         2AEC (10988)
RRC state:   DISCONNECTED   	Cell ID:     0B9183BB (194085819)
RxM RSSI C0:   -90		RxD RSSI C0:  --- 
RxM RSSI C1:    --- 		RxD RSSI C1:  --- 
OK
  
Mon Jul 30 19:36:43 2018 : /dev/ttyUSB2 AT+CPMS="SM"
+CPMS: 0,30,0,30,0,30
OK
  
Mon Jul 30 19:36:44 2018 : /dev/ttyUSB2 AT+COPS=0
OK
  
Mon Jul 30 19:36:45 2018 : /dev/ttyUSB2 AT+CGDCONT=?
+CGDCONT: (1-24),"IP",,,(0-2),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"PPP",,,(0-2),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"IPV6",,,(0-2),(0-4),(0-1),(0-1)
+CGDCONT: (1-24),"IPV4V6",,,(0-2),(0-4),(0-1),(0-1)
OK
  
Mon Jul 30 19:36:47 2018 : /dev/ttyUSB2 AT+CGDCONT?;+CFUN?
+CGDCONT: 1,"IPV4V6","broadband","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CFUN: 1
OK
  
Mon Jul 30 19:37:03 2018 : /dev/ttyUSB2 AT+CPMS="SM"
+CPMS: 0,30,0,30,0,30
OK

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JimHelms
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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JimHelms » Sun Jan 13, 2019 5:20 pm

The only other possibilities that come to mind is either the SIM card is NOT activated, or the wrong APN is being used. This is an AT&T SIM card plan that uses the broadband APN?

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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JimHelms » Sun Jan 13, 2019 5:28 pm

Run the command to see if it is reading the phone number assigned to the SIM card:

Code: Select all

AT+CNUM
Then, to see if the modem is obtaining an IP address, run:

Code: Select all

AT+CGPADDR

JamesReinhold
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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JamesReinhold » Sun Jan 13, 2019 5:35 pm

Code: Select all

AT+CNUM
OK
Pretty sure it should come back with the phone number assigned, correct? Along with this, I also noted under Modem -> Network Status -> Modem/SIM Information that the SIM Phone Number field is just "*" (also same for SIM Name).

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JimHelms
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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JimHelms » Sun Jan 13, 2019 6:00 pm

Does the

Code: Select all

at+cpin?
return OK

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Re: Need help with new WG3526 - MC7455 | AT&T SIM - Not connecting to LTE

Post by JimHelms » Sun Jan 13, 2019 6:02 pm

JamesReinhold wrote:
Sun Jan 13, 2019 5:35 pm

Code: Select all

AT+CNUM
OK
Pretty sure it should come back with the phone number assigned, correct? Along with this, I also noted under Modem -> Network Status -> Modem/SIM Information that the SIM Phone Number field is just "*" (also same for SIM Name).
It should. There is the remote chance the SIM card is defective.

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