Good morning

Previously was using a EX230V Router supplied by my broadband provider and had to buy 3x HX220 mesh wifi extenders to reach the whole house (4 bed house 2 story).

We have changed internet providers and they have supplied me a ZYXEL EX3301-T0 router. My internet provider said I should connect one of my HX220 to the SSD box and set it up that way but there isn't any way of getting the new router on the Aginet app is there? I cant figure it out. 

Once I disconnect the HX220 from the SSD box I lose internet. The HX220's I have dotted around the house so it cant be connected to the SSD all the time. 

Im also not very knowledgeable with this kind of thing so that doesn't help so I appreciate any help you can give me please.

Thank you in advance