Hi, Yes TL-WPA4220 will definitely work. Just pair it with the master or the other powerline adapter to join the network. They are compatible. All tplink powerline are compatible.

Hi, Acutally even though there is no high speed option on RE305, you can still configure it in high speed mode. You can do it in any dual band range extenders. https://www.tp-link.com/en/faq-943.html

Hi, HS210KIT does not support 220V. HS210KIT is 3 way switch while HS200 is 2 way.

Hi, Change channel and channel width to avoid interference. https://www.tp-link.com/en/faq-2292.html Reduce number of wireless devices. Make sure firmware is up-to-date. Put the router in open space,...

Hi, It just takes a few minutes usually to upgrade firmware. Are you doing the update on the computer that connects to the LAN port of the router? No power cut off, right? You may need to reboot the...

Hi, How about speed through Ethernet connection? If just Wi-Fi is slow, may change wireless settings. Here's the guide https://www.tp-link.com/en/faq-2170.html Hope that helps