02-27-2019 09:32 PM
I Need to downgrade the firmware version of my new version latest 7821 ip phone to firmware version 9 for compatability with existing IP Phones and CUCM , , , ,Need to know can we do it and in a effective way if we do so can we use all the existing feature without any drawback.
02-27-2019 11:00 PM
02-28-2019 06:29 AM
Not to mention that new features are only available on newer releases, you cannot expect to keep them if you downgrade.
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