@ryg You can use the Deco M4 as a (Main) unit and then try to install it

@ryg My all Deco M4 units are using 1.7.0 beta firmware i do the same steps which i guided you but i don't know why not working for you 😭😭

@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