To find the firmware version on your nowtv box, go to settings, then select systems, then select About, where the firmware version is named software version on screen.
Whilst waiting for nowtv to get back to everybody, have any of you tried going into the secret hidden menu on screen by pressing the Home button 5 times, quickily followed by pressing the FF button 3 times, then quickily press the RW button 2 times on your remote to force a software update ?
Update the software even if on the same version number.
Looks like to me, it's only the nowtv white boxes that are effected when attempting to access & play the All 4 App, where all my non white nowtv boxes are running fine.
I hope the nowtv tech team gets this sorted soon for everybody who is effected.
The white boxes are first generation where they haven't got the processing power grunt of the newer boxes that are dual & quad core.
The white boxes tend to struggle with power hungry Apps such has Netflix, hence the reason maybe Netflix and the UKTV Play Apps are not available on the white boxes.
I might be wrong speculating it's only the white boxes effected when using the All 4 App.
All i can say is my smart freeview and smart 4K nowtv boxes are working fine with the All 4 App currently.