You can upgrade FortiAnalyzer from the latest version of 6.2 directly to FortiAnalyzer 6.4.2.
If you are upgrading from versions earlier than 6.2.0, you must upgrade to FortiAnalyzer 6.2.x first, and then to 6.4.2. We recommend that you upgrade to the latest version of FortiAnalyzer 6.2.
When upgrading to FortiAnalyzer 6.4.2 from FortiAnalyzer 5.4.0 and later, you are not required to wait for a database rebuild before upgrading to the next firmware release in your upgrade path, if your upgrade path involves multiple steps.
For other upgrade paths, see Firmware Upgrade Paths.
This section contains the following topics:
- Upgrading FortiAnalyzer Firmware
- Checking FortiAnalyzer log output
- Checking FortiAnalyzer events
- Downgrading to previous firmware versions
Upgrading the device firmware can trigger an SQL database rebuild. During the database rebuild, new logs are inserted into the database and can be viewed, but existing logs are not available until the rebuild is complete. The time required to rebuild the database depends on the size of the database. You can use the