# The application revision doesn't match the installed firmwar

**URL:** https://forum.sierrawireless.com/t/the-application-revision-doesnt-match-the-installed-firmwar/7581
**Category:** Device Management
**Created:** [November 21, 2014, 9:55am UTC](https://forum.sierrawireless.com/t/the-application-revision-doesnt-match-the-installed-firmwar/7581 "2014-11-21T09:55:28Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Jorn](https://avatars.discourse-cdn.com/v4/letter/j/a6a055/32.png) [@Jorn](https://forum.sierrawireless.com/u/Jorn)
#### Post date: [November 21, 2014, 9:55am UTC](https://forum.sierrawireless.com/t/the-application-revision-doesnt-match-the-installed-firmwar/7581/1 "2014-11-21T09:55:28Z")

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I have trouble updating the firmware of a unit, see Subject.  
What causes this problem? How can I avoid it?

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### Author: ![flefevre](https://avatars.discourse-cdn.com/v4/letter/f/f14d63/32.png) [@flefevre](https://forum.sierrawireless.com/u/flefevre)
#### Post date: [November 24, 2014, 1:29pm UTC](https://forum.sierrawireless.com/t/the-application-revision-doesnt-match-the-installed-firmwar/7581/2 "2014-11-24T13:29:28Z")

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Could you please indicate what is the FW version that is installed on your device?