Issue with Disabling Band 8 on EM7421 Modem via AT Commands

IoT Modules MC/EM Series
1

Hi,

Modem : EM7421
Firmware : SWI9X50C_01.14.03.00 b06bd3 jenkins 2020/09/23 10:53:35

I’m facing an issue with disabling Band 8 on my EM7421 modem using AT commands. Here’s a summary of the situation:

I have the following mask table for disabling Band 8:

0002000004400000, 000007A088080045, 0000000000000000, 0000000000000000, 0000000000000000, 0000000000000000

1
1476×221 18.4 KB

I created a new mask profile with the command:

AT!BAND=10, "Sans_B8", 0002000004400000, 000007A088080045, 0000000000000000, 0000000000000000, 0000000000000000, 0000000000000000

However, when I apply this profile with the command AT!BAND=10, the modem defaults to profile 00 without displaying any error message.

2
2511×268 21.1 KB

I tried selecting another profile, and it works.
3

I also attempted to change an existing band (03), but I encountered the same initial problem.
4

Even in developer mode, I couldn’t resolve the issue.

Do you have any ideas or suggestions to help me solve this issue?

Thanks in advance for your help!

Best regards,

2

i don’t quite see problem:

at!band=?
Index, Name,                        GW Band Mask     L Band Mask 1    L Band Mask 2    TDS Band Mask    L Band Mask 3    L Band Mask 4
00, All bands                     0002000004400000 000007A0880800C5 0000000000000000 0000000000000000 0000000000000000 0000000000000000
01, Europe 3G                     0002000000400000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
02, North America 3G              0000000004000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
06, Europe                        0002000000400000 00000000000800C5 0000000000000000 0000000000000000 0000000000000000 0000000000000000
07, North America                 0000000004000000 0000010000000040 0000000000000000 0000000000000000 0000000000000000 0000000000000000
08, WCDMA ALL                     0002000004400000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
09, LTE ALL                       0000000000000000 000007A0880800C5 0000000000000000 0000000000000000 0000000000000000 0000000000000000

                                                   0000040000000000 - B43
                                                   0000020000000000 - B42
                                                   0000010000000000 - B41
                                                   0000008000000000 - B40
                                                   0000002000000000 - B38
                                                   0000000080000000 - B32
                                                   0000000008000000 - B28
                                                   0000000000080000 - B20
                                                   0000000000000080 - B8
                                                   0000000000000040 - B7
                                                   0000000000000004 - B3
                                                   0000000000000001 - B1
                                  0002000000000000 - B8  (900)
                                  0000000004000000 - B5  (850)
                                  0000000000400000 - B1 (2100)

OK
AT!BAND=10, "CUSTOMER", 0002000004400000, 000007A088080045, 0000000000000000, 0000000000000000, 0000000000000000, 0000000000000000
OK
at!band?
Index, Name,                        GW Band Mask     L Band Mask 1    TDS Band Mask    L Band Mask 2    L Band Mask 3    L Band Mask 4
00, All bands                     0002000004400000 000007A0880800C5 0000000000000000 0000000000000000 0000000000000000 0000000000000000

OK
at!band=10
OK
at!band?
Index, Name,                        GW Band Mask     L Band Mask 1    TDS Band Mask    L Band Mask 2    L Band Mask 3    L Band Mask 4
10, CUSTOMER                      0002000004400000 000007A088080045 0000000000000000 0000000000000000 0000000000000000 0000000000000000

OK
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: EM7421
Revision: SWI9X50C_01.14.03.00 b06bd3 jenkins 2020/09/23 10:53:35
IMEI: 35628111012435
IMEI SV: 13
FSN: 8G224120312345
+GCAP: +CGSM


OK
at!impref?
!IMPREF:
 preferred fw version:    01.14.03.00
 preferred carrier name:  GENERIC
 preferred config name:   GENERIC_002.036_010
 preferred subpri index:  000
 current fw version:      01.14.03.00
 current carrier name:    GENERIC
 current config name:     GENERIC_002.036_010
 current subpri index:    000

OK