# Error 51 updating firmware on MC7305 **URL:** \ **Category:** Uncategorized\ **Created:** [June 30, 2025, 6:41am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182 "2025-06-30T06:41:46Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![p.newton](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@p.newton](https://forum.sierrawireless.com/u/p.newton)\ **Post date:** [June 30, 2025, 6:41am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/1 "2025-06-30T06:41:46Z")
Hi All I have 3 machines that have MC7305 cards in them, they all detect the sim but they show no service When I remove all the drivers and then reinstall the I get a popup saying failed error 51 I have also tried running the one click firmware updater for the card and get the same result Is there a way to reload the firmware on these cards or are they toast? Cheers ---
**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:** [June 30, 2025, 6:50am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/2 "2025-06-30T06:50:10Z")
how about using the old Gobi driver and old SDK in linux? SDK: > **[Linux QMI SDK Software 04.00.27](https://source.sierrawireless.com/resources/airprime/software/linux-qmi-sdk-software-04,-d-,00,-d-,27/#sthash.1cAKcoFT.dpbs)** > > Linux QMI SDK Software 04.00.27 Driver: [https://source.sierrawireless.com/resources/airprime/software/usb-drivers-linux-qmi-software-s2,-d-,42n2,-d-,64/#sthash.NIlWfv07.dpbs](https://source.sierrawireless.com/resources/airprime/software/usb-drivers-linux-qmi-software-s2,-d-,42n2,-d-,64/#sthash.NIlWfv07.dpbs) ---
**Author:** ![p.newton](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@p.newton](https://forum.sierrawireless.com/u/p.newton)\ **Post date:** [July 1, 2025, 3:49am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/3 "2025-07-01T03:49:53Z")
Thanks for your reply I have been messing around with this on linux the last few hours and still not having much luck it just does not seem to create any ports to connect to Where do I find detailed instructions on how to set this up on linux? ---
**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:** [July 1, 2025, 3:52am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/4 "2025-07-01T03:52:38Z")
you can see this document: [https://source.sierrawireless.com/resources/airprime/software/linux-qmi-sdk-application-developer-guide-2,-d-,0/#sthash.RCXYpRYa.dpbs](https://source.sierrawireless.com/resources/airprime/software/linux-qmi-sdk-application-developer-guide-2,-d-,0/#sthash.RCXYpRYa.dpbs) ---
**Author:** ![p.newton](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@p.newton](https://forum.sierrawireless.com/u/p.newton)\ **Post date:** [July 1, 2025, 4:15am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/5 "2025-07-01T04:15:44Z")
The issue is that it does not seem to create any ports to connect to, in windows for instance all that shows in device manager is MC7305 under network adaptors and under sensors it shows the location sensor, but no com ports at all Even when I try and do it in linux there are no ports Have you seen this before? ---
**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:** [July 1, 2025, 4:22am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/6 "2025-07-01T04:22:12Z")
probably this is hardware issue on the devices… In linux, even you don’t install any USB driver, you will still see something in dmesg if the hardware is OK ---
**Author:** ![p.newton](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@p.newton](https://forum.sierrawireless.com/u/p.newton)\ **Post date:** [July 1, 2025, 10:56pm UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/7 "2025-07-01T22:56:02Z")
Is there a guide on how to troubleshoot these cards? I probably have about 40 Sierra Wireless cards that will not work properly varying from 7305 7430 7565 Each time I get a one that is not working I just replace it with another but I have accumulated quite a lot over the last few years and I would like to know if they are fixable or not For instance just yesterday I had 2 more EM7535 cards that show firmware mismatch in putty but when I try and run the generic firmware windows exe it just fails I am sure allot of the other EM7565 I have are the same ---
**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:** [July 2, 2025, 1:07am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/8 "2025-07-02T01:07:18Z")
As said before, if you don’t see any message in linux, probably the module has hardware issue Btw, have you contacted distributor? ---
**Author:** ![p.newton](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@p.newton](https://forum.sierrawireless.com/u/p.newton)\ **Post date:** [July 2, 2025, 1:51am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/9 "2025-07-02T01:51:08Z")
Distributor? these are from used machines that are now out of warranty ---
**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:** [July 2, 2025, 1:52am UTC](https://forum.sierrawireless.com/t/error-51-updating-firmware-on-mc7305/35182/10 "2025-07-02T01:52:54Z")
> [@p.newton](#): > > these are from used machines that are now out of warranty then there is chance that they could have hardware issue, right?