Save a backup copy of your switch configuration before upgrading to new release. New releases contain significant enhancements, which cannot be used in previous software versions. Downgrading to an earlier release will require a compatible configuration file.
Caution
If you need to downgrade the image on ExtremeCloud IQ Managed Switches to release 9.0.0.0, from 9.0.2.0, or later, you must remove the file .telegraf.csv from the /intflash directory if it exists. Failure to do so can cause the switch to crash and revert to 9.0.2.0. For more information, see Downgrade ExtremeCloud IQ Managed Switches to 9.0.0.0.
For devices running VOSS 8.3, Fabric Engine 8.6, or later, that connect to ExtremeCloud IQ using ExtremeCloud IQ Agent versions 0.4.0 or higher, you cannot downgrade to VOSS 8.2.x and connect to the cloud automatically. After you downgrade to VOSS 8.2.x, you lose connectivity to ExtremeCloud IQ so you must install a VOSS 8.2.x compatible ExtremeCloud IQ Agent version to re-establish connectivity.
Contact support for assistance with installation of the VOSS 8.2.x compatible ExtremeCloud IQ Agent version. For the support phone number in your country, visit: www.extremenetworks.com/support/contact.
Note
Prior to Fabric Engine 8.6, 5520 Series and 5420 Series platforms ran VOSS. VOSS support ends for these platforms with VOSS 8.5.x.
For information about how to reinstall ExtremeCloud IQ Agent firmware, see Fabric Engine User Guide.