# Lenovo t480 EM7455 boot error: 1802 unauthorized network card plugged in **URL:** \ **Category:** MC/EM Series\ **Created:** [February 1, 2025, 5:48pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439 "2025-02-01T17:48:26Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![AndrewMc](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@AndrewMc](https://forum.sierrawireless.com/u/AndrewMc)\ **Post date:** [February 1, 2025, 5:48pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/1 "2025-02-01T17:48:26Z")
i dual boot and had the intention of using this card in linux ubuntu 22.04. installed the card today and got the error code 1802. I have since been through the process of resetting the bios, removing the cmos battery, booting into windows and installing the drivers… already have the latest bios update for the Lenovo thinkpad t480. details about the card: EM7455 FRU PN: 01AX748 LENOVO PIN: SW10K97531 i am at a loss now which is how i came across this website. does anyone have a clue what i need to do to get the laptop to boot with the card installed? thanks in advance Andrew ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [February 1, 2025, 6:20pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/2 "2025-02-01T18:20:29Z")
actually what OS are you testing? Ubuntu linux or windows? ---
**Author:** ![AndrewMc](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@AndrewMc](https://forum.sierrawireless.com/u/AndrewMc)\ **Post date:** [February 1, 2025, 7:33pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/3 "2025-02-01T19:33:29Z")
I dual boot windows 10 or 11. But predominantly use ubuntu 22.04. The issue at this point mainly is error 1802 which means i cant boot the laptop up at all. I have tried hot plugging and the device is recognised. I suppose i need to flash the card some how? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [February 2, 2025, 3:10am UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/5 "2025-02-02T03:10:23Z")
Does this help? > [@Lenovo EM7455 on Dell Precision 3520 laptop](https://forum.sierrawireless.com/t/lenovo-em7455-on-dell-precision-3520-laptop/23736/5): > > Hi @neagugeorge , Were you able to access AT command when you got exclamation mark? Any interfaces appear? The issue appears since you’ve used Lenovo EM7455 on Dell laptop. As my opinion, the card is belongs to the OEM cards are obviously meant to be supported by Dell or Lenovo, and not directly by Sierra Wireless. This means that Sierra Wireless will refer you to Dell or Lenovo for support, and they will probably want to know the serial number of your laptop before they let you open any supp… ---
**Author:** ![AndrewMc](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@AndrewMc](https://forum.sierrawireless.com/u/AndrewMc)\ **Post date:** [February 2, 2025, 2:15pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/6 "2025-02-02T14:15:58Z")
Thanks for helping me out with this, have come across that post but im sure i read somewhere that i need a device to connect the card externally as a usb? i dont have one, but i am happy to hot-swap the card to do the flashing. i noticed its possible to do this from within windows too using some script from sierra website? looking to get an understanding of whether its possible to do it from within the laptop or if i really must now buy the adaptor to connect the card via usb externally? thanks again really. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [February 2, 2025, 2:22pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/7 "2025-02-02T14:22:06Z")
i am not sure if you need to flash via usb BTW, if you boot up with Ubuntu linux, are you able to see the module in kernel ? ---
**Author:** ![AndrewMc](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@AndrewMc](https://forum.sierrawireless.com/u/AndrewMc)\ **Post date:** [February 2, 2025, 2:30pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/8 "2025-02-02T14:30:05Z")
also i noticed this line in the script you forwarded me to, # - Clears Band Restrictions and Places Modem in LTE only mode. the card has a gps functionality, i presume this means the gps function will not work after reflashing? i was hoping to use the gps functionality aswell as the LTE. _EDIT: AI says: **Standalone GPS Module** – If your module has a dedicated GPS receiver (like some Quectel or Sierra Wireless modules), setting **LTE-only** **will not affect GPS** because GPS operates separately from cellular connectivity._ As for the details about the kernel: **lsusb** Bus 001 Device 011: ID 1199:9079 Sierra Wireless, Inc. EM7455 **sudo dmesg | grep -i “sierra|wwan|qcserial”** [8284.224255] cdc\_mbim 1-6:1.12 wwan0: unregister ‘cdc\_mbim’ usb-0000:00:14.0-6, CDC MBIM [8284.620807] usb 1-6: Product: Sierra Wireless EM7455 Qualcomm [8284.620811] usb 1-6: Manufacturer: Sierra Wireless, Incorporated [8291.616726] usb 1-6: Product: Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A [8291.616729] usb 1-6: Manufacturer: Sierra Wireless, Incorporated [8291.643406] cdc\_mbim 1-6:1.12 wwan0: register ‘cdc\_mbim’ at usb-0000:00:14.0-6, CDC MBIM, 92:22:de:ef:62:47 **lsmod | grep -E ‘qcserial|qmi\_wwan’** qcserial 24576 0 usb\_wwan 24576 1 qcserial usbserial 69632 2 qcserial,usb\_wwan ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [February 2, 2025, 3:02pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/9 "2025-02-02T15:02:06Z")
I can see that it works already in linux with MBIM interface But seems it is in MBIM only mode. I remember some user can enable AT command port in windows by using configuration.ini: > [@USSD Software for Windows 10](https://forum.sierrawireless.com/t/ussd-software-for-windows-10/25041/35): > > that was the qualcomm modem i placed in my laptop ---
**Author:** ![AndrewMc](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@AndrewMc](https://forum.sierrawireless.com/u/AndrewMc)\ **Post date:** [February 2, 2025, 7:13pm UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/11 "2025-02-02T19:13:26Z")
ok im back, that was short lived, turns out the laptop boots ok repeatedly into either windows or linux (dual boot) when the laptop is restarted or suspended but when i power the laptop off completely i get the 1802 error come up again. not sure what to do at this point as theres nothing online about the issue. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [February 3, 2025, 1:27am UTC](https://forum.sierrawireless.com/t/lenovo-t480-em7455-boot-error-1802-unauthorized-network-card-plugged-in/34439/12 "2025-02-03T01:27:07Z")
you might need to check with Lenovo: > [@EM 7455 -- Lenovo T460 no radio](https://forum.sierrawireless.com/t/em-7455-lenovo-t460-no-radio/8886/3): > > The drivers come from lenovo themselves … but i ask myself also if they need an update. Maybe there is allready a newer version … Not sure if this helps: > [@Change imei on em7455](https://forum.sierrawireless.com/t/change-imei-on-em7455/23235/7): > > in some of device such as Huawei modem can change imei from AT command i understand : there is no way to change IMEI in Sierra brand there is no way No way to change Lenovo P50 whitelist there is no way to buy from any online shop for me! crazy_face if anybody have a new solution about my problem please reply this topic i,m still hopeful stuck_out_tongue_winking_eye tnx in advance [del]