How can I upgrade MySQL Flexible Server to minor version 8.4.8?

AFAIK, the platform manages minor version updates automatically, so you cannot manually select or force an upgrade to a specific minor version like 8.4.8. If your server is currently running on the 8.0 major version, first perform a major version upgrade to the 8.4 LTS release track using either the Azure portal Upgrade button or the Azure CLI. You should be able to trigger this upgrade using the command az mysql flexible-server upgrade --name {your-server-name} --resource-group {your-resource-group} --version 8.4.

Once your server is on the 8.4 track, Microsoft handles minor version patching on a monthly release cycle during your defined planned maintenance window. New minor versions like 8.4.8 would be automatically bundled into these monthly service patches once they have been tested and validated for the Azure platform infrastructure. You can check your current exact minor engine version at any time by running the SQL query SELECT VERSION(); or by executing the Azure CLI command az mysql flexible-server show --resource-group {your-resource-group} --name {your-server-name} --query "fullVersion". If you require this specific bug fix immediately before it rolls out to your region, your primary alternative is to spin up a standalone container or virtual machine instance to host MySQL 8.4.8 directly and migrate your data.

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hth

Marcin