We have a combination of six TP-PA4010s and two TP-WPA4220s in use at home and for the last year or two the Wi-Fi has become very unreliable, requiring the TP-WPA4220s to be constantly switched off and on again. I read elsewhere on the forum that the 2019 firmware might be to blame, and that a downgrade to a v4 2018 firmware might improve things. However, I have no idea where to download older firmware from! Only the latest seems to be available via tp-link?

Any help or pointers much appreciated!