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4 changes: 4 additions & 0 deletions reference/tiflash/upgrade.md
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# Upgrade TiFlash Nodes

> **Note:**
>
> To upgrade TiFlash from the Pre-RC version to a later version, contact [PingCAP](mailto:info@pingcap.com) for more information and help.

Before the upgrade, make sure that the cluster is started. To upgrade TiFlash nodes, take the following steps:

1. Run the upgrade command:
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