From the IPS LSM:

1. Login to the LSM as a SuperUser
2. Navigate to System->Update or System->Update->Update Summary.
3. All available TOS versions will be listed under Previous TOS Versions.
4. In the Currently Installed Versions section, click the black circle-arrows in the Function(s) column to start the rollback process.
5. A warning message will appear. 
   • "This will roll back to the latest version listed in the "Previous TOS Versions" table below. Your system will be rebooted. All changes made since the latest version was installed will be lost. The rollback process will take several minutes. Please do not execute other operations until after reboot."
6. Click OK to continue or Cancel to stop.  The rollback procedure will automatically reboot your IPS if you click OK. 

Note: You can only rollback one TOS version at a time to the most recent previously installed version.  Selecting the rollback option will cause the IPS to perform a reboot -full, which will execute a full system restart.  The reboot can take anywhere from 5-10 minutes and during this period the device will not be able to pass traffic.

From the TPS LSM:

1. Login to the LSM as a SuperUser
2. From the menu bar, select System > Update > System, DV, Licenses.
3. In the Software Version panel, select the version you want to roll back to, and click Rollback To. The Software Rollback dialog is displayed warning you that any configuration changes made since this version was last run will be lost.
4. Click OK to start the rollback operation.
5. When the rollback completes, verify the master key on the device is the same as the master key that was used to secure the keystore in the rollback TOS image.