Find out how to remove the current level of firmware when you are using i5/OS® so you can return to a previous level of server firmware or power subsystem firmware.
When you shut down the i5/OS service partition to remove the server firmware fixes, system reference code D6xx430B or D6xx430A might be displayed for an extended period of time. The xx should increment periodically and is a normal part of processing when server firmware fixes are being installed or removed. Allow the server to complete the processing; do not interrupt this process.