@ryg I have guided you all the steps before the TP-LINK engineers but unfortunately all the steps did'nt work 😭 But i think you can try 192.168.68.1 or tplinkdeco.net to install the beta firmware...

@ryg Can you show me your Deco M4 ip address in Deco App because i think you are typing the wrong ip address

@ryg Yes u can try Google Chrome Browser

@ryg Please use Google Chrome Browser then try again

@ryg No everything working fine for me. You can install this old beta firmware 1.7.0 which was released in January 2024...

@ryg Do factory reset and do the setup again and use Deco M4 as a (Main Unit) and then install the firmware by login the Web UI (192.168.68.1) and when the beta firmware installed successfully then...