I am going to upgrade the Extreme Summit Switches x460 from 22.214.171.124 to 126.96.36.199. Is that any required path need to achieve first or can directly upgrade from 12.5 to 16.1 within one step? Thanks for your help.
You may find the upgrade procedure here. For x460 upgrade, download the image to alternate partition and then reboot (By default, the boot partition will be changed to alternate partition after image download). If you have modules like SSH module, you need to install it prior to reboot.