TPL-WPA4220 v1 Firmware Upgrade - Home Network Community
TP-Link TL-WPA4220 Driver and Firmware Downloads
Amazon.com: TP-Link Powerline WiFi Extender - Add-on Single Adapter, Ethernet over Powerline, Plug & Play, Compatible with all TP-Link powerline adapters with different speed, AV600 with N300 WiFi(TL-WPA4220) : Everything Else