MC7455 lost IMEI after firmware upgrade

IoT Modules
1

I have carried out a firmware update from version 02.33.03.00 to version 02.38.00.00 . After that, the original IMEI number was no longer displayed. I have downgraded to version 02.20.03.00 without success. LTE has also stopped working since then.
How can I restore the the orig. IMEI?

ati
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.20.03.00 r6691 CARMD-EV-FRMWR2 2016/06/30 10:54:05
IMEI: 001027009999999
IMEI SV:  6
FSN: LQ907144550210
+GCAP: +CGSM

at!gstatus?
!GSTATUS: 
Current Time:  872              Temperature: 29
Reset Counter: 18               Mode:        ONLINE         
System mode:   WCDMA            PS state:    Not attached 
WCDMA band:    WCDMA 1900 
WCDMA channel: 9796
GMM (PS) state:DEREGISTERED     PLMN SEARCH    
MM (CS) state: IDLE             PLMN SEARCH    

WCDMA L1 state:L1M_ACQ          LAC:         0000 (0)
RRC state:   DISCONNECTED       Cell ID:     00000000 (0)
RxM RSSI C0:    ---             RxD RSSI C0:  --- 
RxM RSSI C1:    ---             RxD RSSI C1:  --- 


AT!IMAGE?
TYPE SLOT STATUS LRU FAILURES UNIQUE_ID   BUILD_ID
FW   1    GOOD   1   0 0      ?_?         02.20.03.00_?
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      002.017_000 02.20.03.00_GENERIC
Max PRI images: 50


at!impref?
!IMPREF: 
 preferred fw version:    02.20.03.00
 preferred carrier name:  GENERIC
 preferred config name:   GENERIC_002.017_000
 current fw version:      02.20.03.00
 current carrier name:    GENERIC
 current config name:     GENERIC_002.017_000
2

Didn’t it already operated in version 02.20.03.00?

Does LTE work in firmware version 02.38.00.00?

3

With the shipped Version 02.33.03.00 LTE was functional.
After upgrade to 02.38.00.00 only GSM/WCDMA band functional.
The downgrade to 02.20.03.00 had no effect (only GSM/WCDMA band).

4

then why don’t you go back to FW 02.33.03.00?

5

I have also tried versions 02.33.03.00, 02.30.01.01 and 02.24.05.06, but without success.

6

Did you connect the antenna?
I don’t see the signal strength

7

The antenna is connected.

8

can you go back to FW 02.33.03.00 and check the followings?


Ati3
AT!ENTERCND="A710"
at!IMPREF?
AT!PCINFO?
AT+CFUN?
AT!UIMS?
AT+CPIN?
at+cgdcont?
AT!GSTATUS?
AT!BAND?
AT!SELRAT?
9

Ati3

Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
IMEI: 001027009999999
IMEI SV: 20
FSN: LQ907144550210
+GCAP: +CGSM

AT!ENTERCND=“A710”
at!IMPREF?

!IMPREF: 
 preferred fw version:    02.33.03.00
 preferred carrier name:  GENERIC
 preferred config name:   GENERIC_002.072_001
 preferred subpri index:  000
 current fw version:      02.33.03.00
 current carrier name:    GENERIC
 current config name:     GENERIC_002.072_001
 current subpri index:    000

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

AT+CFUN?

+CFUN: 1

AT!UIMS?

!UIMS: 0

AT+CPIN?

+CPIN: READY

at+cgdcont?

+CGDCONT: 1,"IPV4V6","internet.telekom","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0

AT!GSTATUS?

!GSTATUS: 
Current Time:  245              Temperature: 30
Reset Counter: 3                Mode:        ONLINE         
System mode:   WCDMA            PS state:    Not attached 
WCDMA band:    WCDMA 1900 
WCDMA channel: 9717
GMM (PS) state:DEREGISTERED     PLMN SEARCH    
MM (CS) state: IDLE             PLMN SEARCH    

WCDMA L1 state:L1M_ACQ          LAC:           0000 (0)
RRC state:   DISCONNECTED       UTRAN Cell ID: 00000000 (0)
RxM RSSI C0:    ---             RxD RSSI C0:  --- 
RxM RSSI C1:    ---             RxD RSSI C1:  ---

AT!BAND?

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

AT!SELRAT?

!SELRAT: 00, Automatic
10

here says 3G network has been shutdown for Deutche Telekom:

Can you lock the module to LTE mode in AT!SELRAT command and check again AT!GSTATUS?

BTW, have you tried AT!RMARESET command to see if IMEI can be restored?

11

I now that GSM and UMTS is down. Thats the reason that i need LTE.
I have try selrate with any FW version with same result.

at!selrat=?
!SELRAT: Index, Name
00, Automatic
01, UMTS 3G Only
02, Not Supported
03, Not Supported
04, Not Supported
05, Not Supported
06, LTE Only
07, Not Supported
08, Not Supported
09, Not Supported
0A, Not Supported
0B, Not Supported
0C, Not Supported
0D, Not Supported
0E, Not Supported
0F, Not Supported
10, Not Supported
11, UMTS and LTE Only
12, Not Supported
13, Not Supported
14, Not Supported
AT!SELRAT=01
OK
AT!SELRAT=06
ERROR
AT!SELRAT=11
OK
!GSTATUS: 
Current Time:  1550             Temperature: 30
Reset Counter: 3                Mode:        ONLINE         
System mode:   WCDMA            PS state:    Not attached 
WCDMA band:    WCDMA 1900 
WCDMA channel: 9786
GMM (PS) state:DEREGISTERED     PLMN SEARCH    
MM (CS) state: IDLE             PLMN SEARCH    

WCDMA L1 state:L1M_ACQ          LAC:           0000 (0)
RRC state:   DISCONNECTED       UTRAN Cell ID: 00000000 (0)
RxM RSSI C0:    ---             RxD RSSI C0:  --- 
RxM RSSI C1:    ---             RxD RSSI C1:  ---

And yes i have also try AT!RMARESET .

12

it is strange that AT!SELRAT cannot set to LTE only…
did you try to set AT!BAND to have LTE band only?

13

Yes. The same.
06, Europe
09, LTE ALL

at!band=06
OK
at!band=09
ERROR
14

can you also provide the following output?

ATI
AT!ENTERCND="A710"
AT!NVBACKUP?
AT!PCINFO?
AT!SKU?
AT!PRIID?
AT!CALID?
AT!CALINFO?
AT!USBCOMP?
AT!IMAGE?
AT!FMBADBLOCKS?
15 
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
IMEI: 001027009999999
IMEI SV: 20
FSN: LQ907144550210
+GCAP: +CGSM

!NVBACKUP: 
0 Factory
3 Latest

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

AT!SKU?
SKU: Unset

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

Carrier PRI: 9999999_9904609_SWI9X30C_02.33.03.00_00_GENERIC_002.072_001

AT!CALID?
Calibration Information:
Station ID: Not Defined
Date: Not Defined
Software version: Not Defined
Configuration version: Not Defined

AT!CALINFO?
ERROR

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

AT!IMAGE?
TYPE SLOT STATUS LRU FAILURES UNIQUE_ID   BUILD_ID
FW   1    GOOD   1   0 0      ?_?         02.20.03.00_?
FW   2    GOOD   2   0 0      ?_?         02.33.03.00_?
FW   3    EMPTY  0   0 0                  
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      002.072_001 02.33.03.00_GENERIC
Max PRI images: 50

AT!FMBADBLOCKS?
MT29F4G08ABBEAH4 (2048 blocks):
0x00000117, 0x000001B7, 0x00000313, 0x00000406, 0x000004BD, 0x00000513, 0x00000579, 0x00000615, 
8 Bad blocks found.
16

This module has somehow been wiped clean.
It seems the module has lost the calibration data and other SKU information

If AT!RMARESET=1 or or AT!RMARESET=2 or AT!RMARESET=3 cannot recover, then I think this module needs to do RMA

17

All 3 commands have the same output

AT!RMARESET=3
!RMARESET: DEVICE REBOOT REQUIRED

Items Restored:  0
Items Deleted:   0

ERROR

With no success. No LTE and no IMEI.

Where can I send it to?

18

you need to contact your distributor

19

OK. Thanks for the Support.
BTW: Your Documentation “EM-MC74xx AT Command Reference” is good.