Users Guide

Downgrading OS10 software
This chapter explains how to downgrade OS10 on Dell EMC PowerSwitches.
OS10 supports downgrading to an earlier release using the image install command. The following table lists the sections in
this chapter.
NOTE: Instead of a downgrade, you can rollback to an earlier release when the previous image is available in the system as
the standby image.
NOTE: (Applicable only for VLT and SFS deployments) Before you downgrade, review the information in the Dell EMC
SmartFabric OS10 certificate expiration and recommended action section.
● If you have installed the new X.509v3 certificates or are currently on a release that includes the fix, downgrading to one
of the affected versions will result in traffic loss. If you are downgrading to an affected release, after downgrade, you
must update the certificates on all the nodes using the script (for VLT and SFS cluster convergence). You will need a
maintenance window to perform this operation.
● If you have installed the new X.509v3 certificates or are currently on a release that includes the fix, and are
downgrading to one of the fixed releases (10.4.3.7, 10.5.0.9, 10.5.1.9, 10.5.2.6 or later), no action is required.
Table 8. Downgrade OS10
Task Section
Downgrade to OS10 release 10.5.0.9 or earlier Downgrade to OS10 release 10.5.0.9 or earlier
Downgrade to OS10 release 10.5.1.9 or later Downgrade to OS10 release 10.5.1.9 or later
Rollback to OS10 release 10.5.0.9 or earlier Rollback from OS10 release 10.5.2.0 or later to 10.5.0.9 or
earlier
Rollback to OS10 release 10.5.1.9 or later Rollback from OS10 release 10.5.2.0 or later to 10.5.1.9 or later
NOTE: Downgrade is not supported for IOMs in the fabric (PowerEdge MX deployments).
Downgrade to OS10 release 10.5.0.9 or earlier
In this example, the OS10 switch runs the 10.5.1.0 software and the following procedure downgrades the system to Release
10.5.0.9.
NOTE:
● If the version that you are downgrading to is present in the system as the standby image, you can rollback to that
release without losing configuration or license data. To view the standby image version, use the show boot detail
command. For more information, see the Rollback from OS10 release 10.5.2.0 or later to 10.5.0.9 or earlier section.
● If the image that you are downgrading to is newly installed using the image install command, backup of the
original configuration data will not be available. The system boots with the default configuration. If you have a copy
of the backup configuration file (.xml) obtained from the earlier release that you are downgrading to, apply the saved
configuration and license files as described the following procedure.
Prerequisites
Obtain a backup of the configuration data. Ensure that you have a copy of the license files. Reapply the configuration data and
licenses files after you reload the 10.5.0.9 or earlier image.
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