> For the complete documentation index, see [llms.txt](https://docs.devolutions.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.devolutions.net/rdm/fr/knowledge-base/troubleshooting-articles/prevent-data-loss-when-upgrading-devolutions-server.md).

# Prévenir la perte de données lors de la mise à niveau de Devolutions Server

L'activation du [jeu d'autorisations Personnalisé + Hérité](https://docs.devolutions.net/fr/rdm/user-groups-based-access-control/permissions/) dans Devolutions Server 2025.1 lors de l'utilisation d'une version obsolète de Remote Desktop Manager (2024.3 ou antérieure) peut entraîner une perte de données.

### Solution

Pour éviter ce problème, mettez à jour Remote Desktop Manager vers la ***version 2025.1***. Si une perte de données survient, contactez le [service d'assistance Devolutions](mailto:service@devolutions.net) pour obtenir de l'aide.


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# Agent Instructions
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## Querying This Documentation
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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

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