In as much as auto-unprotect is the granddaddy of all packages, from when there was practically no other infrastructure, its requirements seem to have inflated rather a lot. Busybox?
- satisfy_dependencies_for: Cannot satisfy the following dependencies for auto-unprotect:
- busybox * inotify-tools * hmt * recmon (>= 2.0.7) * webif (>= 1.2.4) *
- opkg_install_cmd: Cannot install package auto-unprotect.
(for the OP's benefit) See https://hummy.tv/forum/threads/wifi-dongle-compatibility.10150:Use an Ethernet-Wireless converter.
There are alternatives to wired network or a WiFi dongle: HomePlug (AKA Powerline, eg Devolo), or a nano-router used in client mode (eg TP-Link WR702N).