Posted by Gnomad on Aug 13, 2019; 11:55pm
URL: https://itus.accessinnov.com/FIRMWARE-Itus-Networks-Shield-Firmware-Upgrade-WIP-tp1726p1825.html

I don't know much about opkg or building for 'nix but I remember there were changes made in /etc/opkg.conf for architecture..  Also I notice `option check_signature 1` commented out.  Might offer a lead?
https://github.com/ItusShield/Shield-Master/blob/master/etc/opkg.conf