How to #Upgrade Cisco #9400 Chassis #Software IOS XE :
install remove inactive
copy tftp:/cat9k_iosxe.16.12.04.SPA.bin flash:/
conf terminal
boot system flash:packages.conf
end
install add file flash:cat9k_iosxe.16.12.04.SPA.bin activate commit
dir flash:*.pkg
install remove inactive