@Gordo128 

Hi, Yes, you could continue using the existing Deco Mesh system.

You need to reset the Deco units first to let them unbind to the previous own email ID- hold the bottom reset pinhole for 1s only.

After that, Pick up one of the Deco XE75 Pros(it doesn' matter which one) to connect to your new internet service modem/terminal.

Then please follow App setup wizard/ or the video below to create your New Mesh network:

• 【Deco】How to Set Up a Whole Home Mesh Wi-Fi System (Take Deco BE95 as Example)

If you knew the login ID and password, there is no need to reset the Deco and you could edit the network credentials to suit the new ISP under Deco APP>More>Internet Connection type(whether PPPOE or Dynamic IP).

Thank you very much and best regards.