---
title: "9.0.x to 9.0.4 Upgrade Procedure"
canonical: "https://docs.infoblox.com/space/niosupgrade/1320354476/9.0.x%20to%209.0.4%20Upgrade%20Procedure"
format: markdown
---
To upgrade NIOS, perform the following steps:

1. [Download the new upgrade software](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320420017).
2. [Upload the upgrade software to the Grid Master](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1321075220).
3. [Distribute the software upgrade files](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320387270).
4. [Apply the 9.0.4.2 CHF2 hotfix](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1321042321).
5. [Test the upgrade](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320354612).
6. [Perform the actual upgrade](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1321075135).