Found the issue... per the release notes:
Enabling HTTP on a Non-SSH ExtremeWare 7.4 or Later Image
In ExtremeWare 7.3, the CLI command syntax used to enable HTTP is
even when upgrading a non-ssh image. In ExtremeWare 7.4, the
command is used with the option
/
. This command option is only available with the ssh image. Therefore, when upgrading an ExtremeWare 7.3 non-ssh configuration to an ExtremeWare 7.4 non-ssh configuration, the
command will fail.
Let's get your switch upgraded and SSH capable. Here's the SSH Image Request Form for ExtremeWare 7.8.4-patch1-4 (the latest available).
https://extrwebapps.extremenetworks.com/WebApps/Public/ExportControl/?swID=112
The file you want from the download is
code:v784b1-patch1-4.SFxtr
I went ahead and gathered the Release Notes for you too: http://tech.extremenetworks.com/ftp/ftp_new.aspx?file=ExtremeWare 7.8.4b1-patch1-4_RelNote.pdf
Let me know if you need anything else!