# EM7421 firmware upgrade

**URL:** <https://forum.sierrawireless.com/t/em7421-firmware-upgrade/34798>\
**Category:** MC/EM Series\
**Created:** [April 29, 2025, 9:52am UTC](https://forum.sierrawireless.com/t/em7421-firmware-upgrade/34798 "2025-04-29T09:52:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ari.suutari](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ari.suutari/32/9906_2.png) [@ari.suutari](https://forum.sierrawireless.com/u/ari.suutari)\
**Post date:** [April 29, 2025, 9:52am UTC](https://forum.sierrawireless.com/t/em7421-firmware-upgrade/34798/1 "2025-04-29T09:52:26Z")

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Hi,

We have bunch of machines with EM7421 modems that sometimes experience mysterious communication breaks for which we have been unable to find any cause.

But looking at modems with ATI-command I get:

Manufacturer: Sierra Wireless, Incorporated  
Model: EM7421  
Revision: SWI9X50C\_01.14.03.00 b06bd3 jenkins 2020/09/23 10:53:35

So the firmware is oldish, making me think about updating it.  
It seems that there are versions 1.14.22.00 and 1.14.13.00 available for download.

I had a look at Linux fw-download-tool which is the utility to use here as far as I understand  
and the process looks quite straightforward. Anything I should take in account before  
updating or shall I just go and do it ?

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**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:** [April 29, 2025, 10:28am UTC](https://forum.sierrawireless.com/t/em7421-firmware-upgrade/34798/2 "2025-04-29T10:28:21Z")

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You can just upgrade the firmware after installing the MBPL USB drive

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<div class="post-metadata">

**Author:** ![ari.suutari](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ari.suutari/32/9906_2.png) [@ari.suutari](https://forum.sierrawireless.com/u/ari.suutari)\
**Post date:** [April 29, 2025, 10:42am UTC](https://forum.sierrawireless.com/t/em7421-firmware-upgrade/34798/3 "2025-04-29T10:42:08Z")

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Drivers in stock Debian are not valid for this ? So drivers from MBPL are required ?

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<div class="post-metadata">

**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:** [April 29, 2025, 10:57am UTC](https://forum.sierrawireless.com/t/em7421-firmware-upgrade/34798/4 "2025-04-29T10:57:25Z")

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I don’t know, you can give a try