This upgrade method currently does not support GX400 and LS300.
If port 80 is closed, then to upgrade legacy ALEOS devices using the AMM, the following should be done:
Login to the AMM as an administrator.
Navigate to Admin > System > Configuration.
The value of Web UI Access Over HTTP should be set to no.
The value of Restrict Gateway Software Upgrade to Secure Channel should be set to yes.
The value of ALEOS Management Tunnel should be set to no.
Apply the change.
Navigate to Admin > Software > Distribution and upgrade as per normal.