@Awddrake94 EX230V is an ISP provided device and it's quite possible that its firmware is customized for the ISP. This could be the reason after reset the default password to be different than the...

@johnvick2 When configuring RE200 (use this guide) select the "Copy from Main Router/AP" option to have the same SSID on both 2.4 and 5 GHz bands.

@Filip123 EX220 is an ISP router, most probably with a customized firmware for your ISP. This could be the reason after resetting, its wireless SSID to be the same as before. For more details on that...

@Serse Ideally, your wireless settings should look like this:

@Serse One possible reason could be the distance between the MR200 and the boiler module - here are some advises for placing the router. Another reason could be the using of Smart Connect feature -...

@Akhilrajaman Try Dynamic IP address then. If that doesn't work for you either, your ISP probably is using a PPPoE connection. You may contact them for the details.