EM7455 - WE826 - AT&T Connection Issues

[odumifi]

Hello, I am looking for support in setting up a EM7455(Dell branded) in a WE826-T2. I received everything pre-assembled but unfortunately was not able to connect and ended up erasing the out of the box firmware with a bad command(at!RMARESET=1).

After some trial and error(and lots of reading on the site) I was able to remove the EM7455 from the WE826 and inserted into my Windows machine where I successfully flashed the generic firmware back to the EM7455. To confirm i have provided the output below.

The issue is now the device IMEI does not match what is on the card and also does not match the value before I erased everything. It seems to be generating a spoofed error value(Modem IMEI: *****09999999999). I am also still unable to connect to the AT&T Network utilizing my prepaid Data SIM which has been verified by AT&T representative as valid.

Would appreciate if someone could assist in getting me pointed in the right direction? I've gone through the troubleshooting guide a few times with no luck and could use a fresh take. Thanks to all.

Code: Select all

AT!USBVID?
!USBVID: 
1199

OK

Code: Select all

AT!USBPID?
!USBPID: 
APP : 9071
BOOT: 9070

OK

Code: Select all

AT!USBPRODUCT?
EM7455

OK

Code: Select all

AT!IMAGE?
TYPE SLOT STATUS LRU FAILURES UNIQUE_ID   BUILD_ID
FW   1    GOOD   127 0 0      ?_?         02.33.03.00_?
FW   2    EMPTY  0   0 0                  
FW   3    EMPTY  0   0 0                  
FW   4    EMPTY  0   0 0                  
Max FW images: 4
Active FW image is at slot 1

TYPE SLOT STATUS LRU FAILURES UNIQUE_ID   BUILD_ID
PRI  FF   GOOD   0   0 0      002.072_000 02.33.03.00_GENERIC
Max PRI images: 50


OK

Code: Select all

at!usbcomp?
Config Index: 1
Config Type:  1 (Generic)
Interface bitmask: 0000100D (diag,nmea,modem,mbim) 

OK

Code: Select all

AT!PCINFO?
State: Online
LPM voters - Temp:0, Volt:0, User:0, W_DISABLE:0, IMSWITCH:0, BIOS:0, LWM2M:0, OMADM:0, FOTA:0
LPM persistence - None

OK

Code: Select all

AT!PRIID?
PRI Part Number: Unknown
Revision: Unknown
Customer: Unknown

Carrier PRI: 9999999_9904609_SWI9X30C_02.33.03.00_00_GENERIC_002.072_000

OK

Code: Select all

AT!GOBIIMPREF?
!GOBIIMPREF: 
 preferred fw version:    02.33.03.00
 preferred carrier name:  GENERIC
 preferred config name:   GENERIC_002.072_000
 preferred subpri index:  000
 current fw version:      02.33.03.00
 current carrier name:    GENERIC
 current config name:     GENERIC_002.072_000
 current subpri index:    000

OK

Code: Select all

at!gstatus?
!GSTATUS: 
Current Time:  2641		Temperature: 44
Reset Counter: 1		Mode:        ONLINE         
System mode:   LTE        	PS state:    Not attached 
LTE band:      B40    		LTE bw:      Unknown 
LTE Rx chan:   31		LTE Tx chan: 4294967295
LTE CA state:  ACTIVE      		LTE Scell band:B16    
LTE Scell bw:Unknown 		LTE Scell chan:0
EMM state:     Deregistered   	Attach Needed  
RRC state:     RRC Idle       
IMS reg state: No Srv  		

PCC RxM RSSI:  0		RSRP (dBm):  0
PCC RxD RSSI:  0		RSRP (dBm):  0
SCC RxM RSSI:  0		RSRP (dBm):  0
SCC RxD RSSI:  0		RSRP (dBm):  0
Tx Power:      --		TAC:         0000 (0)
RSRQ (dB):     115.5		Cell ID:     000121BB (74171)
SINR (dB):     


OK

Code: Select all

at!band?
Index, Name,                        GW Band Mask     L Band Mask      TDS Band Mask
00, All bands,                      0002000007C00000 00000100330818DF 0000000000000000

[odumifi]

Issue was resolved. Updating drivers and firmware via Windows must not have 'stuck'. After utilizing the following script I was able to obtain the factory IMEI and a connection.

I did have to rewrite a small portion(hardcode a variable) of the script as its outdated. I plan on creating a Windows version to use with a 'Mini PCI-E to USB Adapter' as well as updating the script created by Daniel Wood to work on Ubuntu.

If you need assistance utilizing the script from Daniel Wood, please dont hesitate to reach out and I will assist.


Original Script:
https://github.com/danielewood/sierra-w ... sh-7455.sh