https://community.extremenetworks.com/t5/extremeswitching-exos-switch/ex460-g2-downgrade/m-p/35293#M7081 EXOS 15.6.3 is end-of-support and you will need to use a newer version. The switch you have is likely a newer revision with an updated flash memory module that isn't compatible with drivers bundled in older versions of EXOS.<BR /> Wed, 21 Feb 2018 23:00:00 GMT Drew_C 2018-02-21T23:00:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/ex460-g2-downgrade/m-p/35292#M7080 I am trying to degrade Ex460-G2 from 21.1.3.7 to 15.6.3.1. but this is error after loading firmware 15.6.3.1. it shows '15.6.3.1 does not contain a compatible flash memory driver' Wed, 21 Feb 2018 13:39:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/ex460-g2-downgrade/m-p/35292#M7080 wenlong_wang 2018-02-21T13:39:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/ex460-g2-downgrade/m-p/35293#M7081 EXOS 15.6.3 is end-of-support and you will need to use a newer version. The switch you have is likely a newer revision with an updated flash memory module that isn't compatible with drivers bundled in older versions of EXOS.<BR /> Wed, 21 Feb 2018 23:00:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/ex460-g2-downgrade/m-p/35293#M7081 Drew_C 2018-02-21T23:00:00Z