MC7455 No service

choki.dorji · May 7, 2024, 9:19am

I have MC7455 module used on windows OS. it is sowing no service in the network connection. The SIM is in working condition.
I had the generic Firmware installed and the driver also installed in windows. it is identifying SIM network but it is showing as no service. Please see the attached screenshot.

the following are the behavior that was noticed on these modems:

when the band is set to 9 using the AT!BAND=09, throws error. but it can be set to other bands except for the band 9 LTE all
2.not sure this is related, all the modems that can’t be set to band 9 LTE ALL are with the no service on the cellular.
These modems also didn’t had the restore points. Normally the restore point 01 is for sierra-provided SKU configuration. this is not available, if this means something.

jyijyi · May 7, 2024, 9:29am

what is the return of the followings for OK module and NOK modules?


AT!ENTERCND="A710"
ati3
AT!impref?
AT+cpin?
aT!pcinfo?
AT+cfun?
AT!selrat?
aT!band?
AT!GSTATUS?
AT+CGDCONT?

choki.dorji · May 8, 2024, 3:11am

Hi Jyijyi,

Thanks for you quick response.

Please see the results of the AT commands that you have sent.

Working module:

AT!IMPREF?
!IMPREF:
preferred fw version: 02.38.00.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.082_000
preferred subpri index: 000
current fw version: 02.38.00.00
current carrier name: GENERIC
current config name: GENERIC_002.082_000
current subpri index: 000

OK
at!band?
Index, Name
00, All bands

OK
at+cgdcont?
+CGDCONT: 1,“IPV4V6”,“yesinternet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

OK
atr
ERROR
at!band=09
OK
at!BAND=00
OK
AT!CPIN?
ERROR
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
AT!SELRAT?
!SELRAT: 00, Automatic

OK
ATi3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13 05:16:00
MEID: 35907206958601
IMEI: 359072069586010
IMEI SV: 22
FSN: LQ048407150110
+GCAP: +CGSM

OK
AT!GSTATUS?
!GSTATUS:
Current Time: 174 Temperature: 52
Reset Counter: 2 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B1 LTE bw: 20 MHz
LTE Rx chan: 299 LTE Tx chan: 18299
LTE CA state: NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC RxM RSSI: -72 RSRP (dBm): -105
PCC RxD RSSI: -93 RSRP (dBm): -140
Tx Power: – TAC: E86D (59501)
RSRQ (dB): -14.3 Cell ID: 01A75942 (27744578)
SINR (dB): 0.2

OK
AT+CFUN?
+CFUN: 1

OK
AT!IMPREF?
!IMPREF:
preferred fw version: 02.38.00.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.082_000
preferred subpri index: 000
current fw version: 02.38.00.00
current carrier name: GENERIC
current config name: GENERIC_002.082_000
current subpri index: 000

OK
at!band?
Index, Name
00, All bands

Non-working module:

AT!IMPREF?
!IMPREF:
preferred fw version: 02.38.00.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.082_000
preferred subpri index: 000
current fw version: 02.38.00.00
current carrier name: GENERIC
current config name: GENERIC_002.082_000
current subpri index: 000

OK
AT!IMAGE?
TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
FW 1 GOOD 6 0 0 ?? 02.33.03.00?
FW 2 GOOD 7 0 0 ?? 02.38.00.00?
FW 3 GOOD 3 0 0 ?? 02.32.11.00?
FW 4 EMPTY 0 0 0
Max FW images: 4
Active FW image is at slot 2

TYPE SLOT STATUS LRU FAILURES UNIQUE_ID BUILD_ID
PRI FF GOOD 0 0 0 002.070_005 02.32.11.00_ATT
PRI FF GOOD 0 0 0 002.082_000 02.38.00.00_GENERIC
PRI FF GOOD 0 0 0 002.079_002 02.33.03.00_VERIZON
Max PRI images: 50

OK
AAT!ENTERCND=“A710”
OK
ATI3
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13 05:16:00
MEID: 35907206958347
IMEI: 359072069583470
IMEI SV: 22
FSN: LQ003185220310
+GCAP: +CGSM

OK
AT+CPIN?
+CPIN: READY

OK
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
AT+CFUN?
+CFUN: 1

OK
AT!SELRAT?
!SELRAT: 00, Automatic

OK
AT!BAND?
Index, Name, GW Band Mask L Band Mask TDS Band Mask
00, All bands, 0002000007C00000 00000100330818DF 0000000000000000

OK
AT!BAND=09
ERROR
AT!GSTATUS?
!GSTATUS:
Current Time: 286 Temperature: 49
Reset Counter: 2 Mode: ONLINE
System mode: WCDMA PS state: Not attached
WCDMA band: WCDMA 850
WCDMA channel: 4436
GMM (PS) state:DEREGISTERED LIMITED SERVICE
MM (CS) state: IDLE LIMITED SERVICE

WCDMA L1 state:L1M_PCH_SLEEP LAC: 7850 (30800)
RRC state: DISCONNECTED UTRAN Cell ID: 03A30169 (61014377)
RxM RSSI C0: -76 RxD RSSI C0: —
RxM RSSI C1: — RxD RSSI C1: —

OK
AT+CGDCONT?
+CGDCONT: 1,“IPV4V6”,“3gnet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

OK

jyijyi · May 8, 2024, 3:36am

how about setting to LTE technology by AT!SELRAT?
You can check the setting of AT!SELRAT=?

choki.dorji · May 8, 2024, 6:17am

I tried to set the selrat to LTE but it is throwing error.
it looks like the module cannot be set to anything related to LTE technology. the following two commands returns error:

AT!BAND=09
AT!SELRAT=06

The command AT+CGDCONT? on the non-working module returns:
AT+CGDCONT?
+CGDCONT: 1,“IPV4V6”,“3gnet”, “0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
but on the working module it returns as below:
+CGDCONT: 1,“IPV4V6”,“yesinternet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
does this indicate anything?

jyijyi · May 8, 2024, 6:21am

it indicates different APN is used in the module
Are they using the same SIM card for your testing above?
Is no, have you tried to swap the SIM card between two modules?
Is the 3gnet SIM card only workable in 3G?

choki.dorji · May 8, 2024, 6:53am

The same SIM card has been used for the test and the APNon the non-working modules is showing up as 3gnet. i also tried to set the APN to “yesinternet” using the command AT+CGDCONT=
But it is still showing as no service on the cellular connection. The 3gnet is being shown on every unit which have this issue. seems like it is showing as “3gnet” for every different SIM card used on those non-working modules.

jyijyi · May 8, 2024, 7:05am

have you checked if AT!UIMS? is equal to 0 in both OK module and NOK module?

choki.dorji · May 8, 2024, 9:14am

The AT!UIMS? is returning 0 on both the working and Non-working module.
Anther thing noticed on the non-working module is that even if the new SIM from different provider is used, the command AT+CGDCONT? returns
+CGDCONT: 1,“IPV4V6”,“yesinternet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

Seems like the APN does not change according to the SIM used but on the working module it changes the APN according to the SIM card used.

jyijyi · May 8, 2024, 9:36am

didn’t the NOK module is using 3gnet as APN here?

(not using “yesinternet”)

BTW, have you compared AT!CUSTOM? setting

choki.dorji · May 8, 2024, 10:09am

Yes it was before i set it to “yesinternet” and the SIM i am using just now is from different provider so i should have change when i use this SIM. But it remained at “yesinternet”.

I have executed the AT!CUSTOM? on both the units:

working Module:
AT!CUSTOM?
!CUSTOM:
GPSENABLE 0x01
GPSLPM 0x01
IPV6ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01

Non-working Module:
AT!CUSTOM?
!CUSTOM:
GPSENABLE 0x01
GPSLPM 0x01
IPV6ENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
SINGLEAPNSWITCH 0x01

It seems that the non-working module have the SINGLEAPNSWITCH.

jyijyi · May 8, 2024, 12:58pm

Is there any improvement to make the same setting in at!custom?

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