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docs/04-starting-an-updated-system-or-service.md
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@@ -99,6 +99,12 @@ Returning to a previous version is called **rollback**. Keeping A available make
[ADR-014: Trial Boot and Confirmation for System Updates](../adr/ADR-014-trial-boot-and-confirmation.md) explains when to choose this policy and what the platform must support.
The state diagram separates an explicit health-check failure from a startup failure that prevents the checks from running. It also shows the checks after returning to A.
![A/B trial boot and recovery](../diagrams/rendered/ab-trial-boot.svg)
[PlantUML source](../diagrams/plantuml/ab-trial-boot.puml) · [Runnable simulation and failure scenarios](../examples/simulations/ab-trial-boot/readme.md)
## 5. Example: Starting an Updated Service
Now imagine a device with a stable system platform and an independently updated communication service. Version 1 works. Version 2 arrives as a package.