https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42054#M9846 Hi An Hong, <BR /> <BR /> Erik is correct. Hitless upgrade is only supported between versions of same major and minor releases.<BR /> <BR /> <A href="http://documentation.extremenetworks.com/exos_16/EXOS_16_2/Software_Upgrade_and_Boot_Options/c_hitless-upgrade-caveats-for-blackdiamond-8800-series-switches-only.shtml" target="_blank" rel="nofollow noreferrer noopener">http://documentation.extremenetworks.com/exos_16/EXOS_16_2/Software_Upgrade_and_Boot_Options/c_hitle...</A><BR /> Wed, 12 Apr 2017 05:16:00 GMT Bin 2017-04-12T05:16:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42052#M9844 My BD8810 MSM-A,B firmware is 15.6.3.1-patch1-5.<BR /> 16.2.2.4-patch1-3, is it possible to upgrade hitless?<BR /> Tue, 11 Apr 2017 12:43:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42052#M9844 An_Hong 2017-04-11T12:43:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42053#M9845 Hi,<BR /> <BR /> I don't think so, based on the following GTAC Knowledge articles:<BR /> <UL> <LI><A href="https://gtacknowledge.extremenetworks.com/articles/Q_A/Is-hitless-upgrade-supported-between-different-major-releases" target="_blank" rel="nofollow noreferrer noopener">Is hitless upgrade supported between different major releases?</A> </LI><LI><A href="https://gtacknowledge.extremenetworks.com/articles/Q_A/Is-Hitless-Upgrade-Possible-For-My-Software-Version" target="_blank" rel="nofollow noreferrer noopener">Is Hitless Upgrade Possible For My Software Version</A></LI></UL>Erik Tue, 11 Apr 2017 13:46:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42053#M9845 Erik_Auerswald 2017-04-11T13:46:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42054#M9846 Hi An Hong, <BR /> <BR /> Erik is correct. Hitless upgrade is only supported between versions of same major and minor releases.<BR /> <BR /> <A href="http://documentation.extremenetworks.com/exos_16/EXOS_16_2/Software_Upgrade_and_Boot_Options/c_hitless-upgrade-caveats-for-blackdiamond-8800-series-switches-only.shtml" target="_blank" rel="nofollow noreferrer noopener">http://documentation.extremenetworks.com/exos_16/EXOS_16_2/Software_Upgrade_and_Boot_Options/c_hitle...</A><BR /> Wed, 12 Apr 2017 05:16:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/my-bd8810-firmware-hitless-upgrade-possible/m-p/42054#M9846 Bin 2017-04-12T05:16:00Z