@lfalcao go to https://tplinkdeco.net/ and that should help you to log in, then click on Advancded (at the top), then system then Firmware Update, from there select your device model and browse to...

Hey, Same problem here. See https://community.tp-link.com/en/home/forum/topic/202628

Can confirm also. Deco M5 V1 with 1.4.4 fails randomly (when 1.4.2 was OK and all firmwares before that as well), wifi goes off and comes back (probably access points restarting?). Went back to 1.4.2...