haven’t used my set top box in a while, tried using it. At first it wouldn’t accept my account details, even after changing password. Unplugged the box as advised on the website, once plugged back in the message no longer supported on this device shows. Tried the fix on here using home button etc but nothing changes, not taken to another screen to update device.
Set top box? Are you referring to the original *white* NowTV box? If so, it is deceased, they switched off support for them some months back & they no longer operate at all.
You should have received an email from then offering a new NowTV stick at a reduced price - you're probably too late now, but you could still try arguing with them and demand a replacement device.
Just to follow up from the advice given by @smithbill17 it is also worth noting that Now TV is available on Amazon fire sticks.
From a personal standpoint the app on and device itself Amazon fire stick is far more reliable than the Now TV stick. So if you can I’d recommend purchasing an Amazon fire stick.