Hi,
Personally i never done a downgrade of clearpass.
In your case you have to do a downgrade of an appliance that now have dirty installation.
If it is virtual you can try to restore a snapshot, if you have it.
With hardware you can perforom a switch of boot partition:
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In the CLI you can change the boot partition back to the older version. It behaves similar to the controllers.
system boot-image -l
(displays version info for the partitions)
system boot-image -a <imagever>
(sets the active boot partition to the version specified)
Tim Cappalli | Aruba Global Enablement
@timcappalli | ACMX #367 / ACCX #480 / ACEAP / CWSP
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Link of disucssion related to version 6.2 and 6.3:
http://community.arubanetworks.com/t5/AAA-NAC-Guest-Access-BYOD/Roll-back-on-Clearpass-Hardware-Appliance/td-p/95286
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On my test appliance where I upgrade by 6.5.0 to 6.5.5:
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[appadmin@CP-500]# system boot-image -l
ClearPass Platform 6.5.5.78974 [Active] on SCSI (0:1)
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I don't see any other partition.... maybe rollback is not longer supported, or is support only for major releases.
I in your cloths would do a fresh install of 6.5.0 and use the backup for restore configuration.
For test maybe is better to use an eval appliance.
the other way can be, open a case with the tac, to verify if there is any suggestions.
Regards
Andrea