My software update came through after I sorted my problems.
What I did was delete the app and disconnected rhe power from the box, I'm using a BT pro.
I'd suggest doing the same, once your box reboots check for a software update in the service menu and run it regardless. Download the app and try again.
Hope it works.
@Ians I unpaired all devices and then followed the instructions via the link posted by @DarrenDev in this thread to perform a maintenance mode reset. My recordings and scheduled recordings were all retained. When you select the link it’s the option after a simple power off, select the pro box when the pictures appear and follow the instructions. I had my tv on and set to my box input so that I could see when it came on to release the buttons. I think it was the top option when the menu appears on screen. Good luck
Thanks to @Ians for providing logs of this issue.
I can confirm that there appears to be a fault with the YouView cloud, preventing the BT TV apps (on both iOS and Android) from retrieving the configuration of the BT TV Box Pro.
Without this important information, the box is behaving the same as the older boxes before they upgraded to the new YouView platform (in 2019), which is why it's triggering the upgrade message you're seeing.
I've raised this as a priority issue with YouView.
As it's been almost 3 years since the YouView migration to the cloud, I think it's time we removed that old message and updated it to something less confusing. I'll do that for the next app update.