Different name after replace modem

[Flavix]

After replaced modem with a new, i have 3 wi fi 1 of new modem and 2+3 of old modem. Why the nightwark work in that way?

[plemans]

After replacing it, did you factory reset the EX8000 and reinstall it? 

What modem do you have? 

what router do you have? 

[Flavix]

Thanks. I had pushed reset button only. I have 2 wifi name -1 with the new modem name But the 2 is the old name of the old 5ghz. Why is it olf name?

[plemans]

You need to go into more details. You're expecting answers off giving me very limited info. 

What modem/gateway do you have? 

What router is the extender connected to? 

How did you setup the extender? using wps, using the installation assistant? 

Did you setup the extender to run using "one ssid" or using its own ssid? 

The old/new network names you're describing. Not sure exactly what you're saying here. 

[Flavix]

You need to go into more details. You're expecting answers off giving me very limited info. 

What modem/gateway do you have?   Zyxel VMG8823

What router is the extender connected to? EX800 AC3000 NIGHTAWK X6S

How did you setup the extender? using wps, using the installation assistant? WPS

Did you setup the extender to run using "one ssid" or using its own ssid? ONE SSID

The old/new network names you're describing. Not sure exactly what you're saying here. Please you can see the images in attach

Now i have 2.4 ghz (Home&Life SuperWiFi-002471) and 5ghz (5ghz Home&Life SuperWiFi-002471)

TheInfostrada-2B95D9-5Ghz was the old name of old modem

[plemans]

Have you checked the wifi settings on the extender to ensure you're using onessid? And its setup properly? 

I attached what mine is setup like. 

[Flavix]

I attached what mine is setup like

[plemans]

Try factory resetting the extender and then rerunning setup using the installation wizard.