can't find extender network in wifi list after getting a new modem and trying to connect it again

[regardless1]

was working fine until I got a new modem and had to reconnect it.

Now the extender network doesnt come up in the wifi list and I cant bring it back

have reseted unit a few times 

I don't have a computer with ethernet port so cannot trouble that way by connecting the unit

Any other way to get the wifi to broacast again from the units 
?

[plemans]

1. what router did you connect it to? 

2. what are all the led's on it doing? (color, blinking, solid, etc. all of them)

3. did you set it up using wps? 

If you set it up using wps, the EX6150v2 is a mesh extender. Meaning it'll use the same ssid as the router. If you log into your router, you might find its IP address in the attached devices list (or equivelent). Try using that ip address to access it?