# EM7455 disconnected, no network connection
**URL:** https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557
**Category:** IoT Modules
**Created:** [January 29, 2024, 8:22am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557 "2024-01-29T08:22:06Z")
**Posts on this page:** 15
**Page:** 1
### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 29, 2024, 8:22am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/1 "2024-01-29T08:22:06Z")
Hello,
I added a Sierra EM7455 card to my thinkpad x270, but since reinstalling Windows the card shows me disconnected, however it recognizes the network operator.
Before doing the reinstalling everything worked fine.
The drivers are up to date via the Lenovo website.
Do you have an idea of the problem?
Thanks.
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 29, 2024, 8:27am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/2 "2024-01-29T08:27:57Z")
how is the response of the following?
ATI3
AT!ENTERCND=“A710”
AT!IMPREF?
AT!GSTATUS?
AT+CFUN?
AT+CPIN?
AT!uims?
AT!USBCOMP?
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 29, 2024, 8:31am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/3 "2024-01-29T08:31:07Z")
> [@jyijyi](#):
>
> how is the response of the following?
Where to find the answer? Sorry I’m not an expert in command lines.
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 29, 2024, 8:35am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/4 "2024-01-29T08:35:18Z")
do you have modem port in device manager?
If yes, you can use tera term to open the port and type AT commands
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 29, 2024, 9:36am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/5 "2024-01-29T09:36:51Z")
I have a wifi card, ethernet card and the EM7455 card. On the other hand, no RJ45 cable, I only work via wifi or with the EM7455.
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 29, 2024, 9:38am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/6 "2024-01-29T09:38:38Z")
do you have modem port in device manager?
you can see this link where the user reinstall the driver with configuration.ini to enumerate the modem port:
> [@USSD Software for Windows 10](https://forum.sierrawireless.com/t/ussd-software-for-windows-10/25041/37):
>
> Done
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 29, 2024, 10:19am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/7 "2024-01-29T10:19:00Z")
Here is the list of components.
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 29, 2024, 11:43am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/8 "2024-01-29T11:43:26Z")
there is no modem port.
you can see this link where the user reinstall the USB driver with configuration.ini (setting USBCOMP=8) to enumerate the modem port:
> [@USSD Software for Windows 10](https://forum.sierrawireless.com/t/ussd-software-for-windows-10/25041/37):
>
> Done
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 30, 2024, 11:20am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/9 "2024-01-30T11:20:05Z")
Here is the result of what you asked me
ATI3
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C\_02.33.03.00 r8209 CARMD-EV-FRMWR2 2019/08/28 20:59:30
MEID: 01458300078882
IMEI: 014583000788827
IMEI SV: 20
FSN: LF821479220310
+GCAP: +CGSM,+DS,+ES
OK
AT!ENTERCND=“A710”
OK
AT!IMPREF?
!IMPREF:
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
AT!GSTATUS?
!GSTATUS:
Current Time: 681 Temperature: 28
Reset Counter: 2 Mode: ONLINE
System mode: WCDMA PS state: Attached
WCDMA band: WCDMA 900
WCDMA channel: 2950
GMM (PS) state:REGISTERED NORMAL SERVICE
MM (CS) state: IDLE NORMAL SERVICE
WCDMA L1 state:L1M\_PCH\_SLEEP LAC: 4EE9 (20201)
RRC state: DISCONNECTED UTRAN Cell ID: 05F04FCD (99635149)
RxM RSSI C0: -63 RxD RSSI C0: —
RxM RSSI C1: — RxD RSSI C1: —
OK
AT+CFUN?
+CFUN: 1
OK
AT+CPIN?
+CPIN: READY
OK
AT!uims?
!UIMS: 0
OK
AT!USBCOMP?
Config Index: 1
Config Type: 1 (Generic)
Interface bitmask: 0000100D (diag,nmea,modem,mbim)
OK
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 30, 2024, 11:57am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/10 "2024-01-30T11:57:28Z")
i can see the module is registered on 3G.
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 30, 2024, 12:25pm UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/11 "2024-01-30T12:25:10Z")
Yes there is a sim card in it, the provider is detected but I don’t have internet
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 30, 2024, 12:34pm UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/12 "2024-01-30T12:34:17Z")
I don’t see problem with MBIM interface on MC7455 in Windows 10:
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 31, 2024, 8:20am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/13 "2024-01-31T08:20:15Z")
Okay, so you don’t know where my problem could come from?
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### Author:  [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)
#### Post date: [January 31, 2024, 8:33am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/14 "2024-01-31T08:33:19Z")
no, i don’t know as i don’t see problem in win10 with MC7455
I don’t even know why your module is kept in 3G mode…
You can try to lock the module to LTE mode by AT!SELRAT and see if it can register network.
BTW, have you entered correct APN for your module in AT+CGDCONT?
You can also try with this skylight tool to see if you can establish data connection in MBIM mode or RMNET mode in AT!USBCOMP:
> **[Skylight Windows Connection Manager for EM/MC series modules](https://source.sierrawireless.com/resources/airprime/software/airprime-em_mc-series-connection-manager/#sthash.ZLN3ryuq.dpbs)**
>
> Skylight Windows Connection Manager for EM/MC series modules
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### Author:  [@seb106\_95](https://forum.sierrawireless.com/u/seb106_95)
#### Post date: [January 31, 2024, 9:53am UTC](https://forum.sierrawireless.com/t/em7455-disconnected-no-network-connection/31557/15 "2024-01-31T09:53:01Z")
Ok thank you I will look at it