# I have a question about the documentation

**URL:** <https://forum.legato.io/t/i-have-a-question-about-the-documentation/5487>\
**Category:** Uncategorized\
**Created:** [November 3, 2020, 9:17am UTC](https://forum.legato.io/t/i-have-a-question-about-the-documentation/5487 "2020-11-03T09:17:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![zuuuuk](https://avatars.discourse-cdn.com/v4/letter/z/e5b9ba/32.png) [@zuuuuk](https://forum.legato.io/u/zuuuuk)\
**Post date:** [November 3, 2020, 9:17am UTC](https://forum.legato.io/t/i-have-a-question-about-the-documentation/5487/1 "2020-11-03T09:17:51Z")

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Hello  
I read documentation

> **[Updates - Legato Docs](https://docs.legato.io/latest/conceptsUpdates.html)**
>
> legato™ is an open source Linux-based embedded platform designed to simplify connected IoT application development

Secrion " Base Read-Only System"  
And i have question.  
What are the reasons for the overlay version to be considered damaged?  
How does the system decide to roll back?

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [November 3, 2020, 9:38am UTC](https://forum.legato.io/t/i-have-a-question-about-the-documentation/5487/2 "2020-11-03T09:38:04Z")

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Here says "Updated or modified systems enter a probationary period (default 30 minutes) during which time an app or framework daemon failure will result in a roll-back to the previous “good” system. "

> **[update - Legato Docs](https://docs.legato.io/latest/toolsTarget_update.html)**
>
> legato™ is an open source Linux-based embedded platform designed to simplify connected IoT application development

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<div class="post-metadata">

**Author:** ![zuuuuk](https://avatars.discourse-cdn.com/v4/letter/z/e5b9ba/32.png) [@zuuuuk](https://forum.legato.io/u/zuuuuk)\
**Post date:** [November 3, 2020, 10:08am UTC](https://forum.legato.io/t/i-have-a-question-about-the-documentation/5487/3 "2020-11-03T10:08:40Z")

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Command call  
**update -g**

Will solve this problem?

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\
**Post date:** [November 3, 2020, 10:53am UTC](https://forum.legato.io/t/i-have-a-question-about-the-documentation/5487/4 "2020-11-03T10:53:33Z")

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Embed your app to legato.cwe is the recommended method