Upgraded from V1 (rented) to V3+ (bought)

Hi

Next to no upgrade instructions I could find so went for it! Changed the bridge - that seemed to be ok -took 30 mins for it to pair with the 10 devices I have. Then switched over the room thermostat (wired to the boiler). All worked but couldn't remove the old one.

10 mins later, every device goes off line! "No remote access" on every device except the room stat. If I go into each device in settings on the desktop web page, I can blink displays - despite it saying no remote connectivity.

Any idea?S

Thanks

Si