Installing and uninstalling Liberty fix packs
You can use IBM® Installation Manager Version 1.8.5 or later to update the product with the fix packs that are available for your service level of the product. Uninstalling fix packs to a previously installed level is called rolling back.
Before you begin
![[17.0.0.3 and later]](../ng_v17003plus.gif)
Java SE 8 is the recommended Java SDK because it provides the latest features and security updates. As an alternative to installing Java SE 8, you can install another supported Java SDK version.
For the most current information about upgrades for Liberty and its associated software, see the IBM Software Support Center and Fix Central.
For a list of fix packs that are available for Liberty and its associated software and for specific information about each fix pack, perform the following actions.
About this task
Installation Manager can install any fix-pack level of the product directly without installing the intermediate fix packs; in fact, Installation Manager installs the latest level by default. For example, you can skip fix-pack levels and go from fix pack 16.0.0.2 directly to fix pack 16.0.0.4. Keep in mind, however, that later you can not roll back to any level that was skipped. If you directly install to fix pack 16.0.0.4, for example, you cannot roll back to fix pack 16.0.0.3. If you skip from fix pack 16.0.0.2 to 16.0.0.4, you can only roll back to 16.0.0.2. The same principle also applies to the common IBM Java SDK fix packs.
When you install a fix pack, Installation Manager automatically reapplies any installed interim fixes if they apply to the updated fix pack level. Interim fixes that do not apply, such as if the updated fix pack contains the fix, are uninstalled. In some cases, Installation Manager must uninstall an interim fix that you must manually reapply. For example, you might update to a fix pack that does not contain the fix and requires an updated interim fix level. Installation Manager notifies you if any interim fixes must be manually reapplied. You can verify which interim fixes are installed by running the productInfo version --ifixes command.
