I’ll enclose the post that i used inc the hidden settings that I also pressed. The poster said to turn on/off the file share settings. I reset my password in the hidden menu and accessed the other options in it. Some only show info and a wifi test, nevertheless, once I had done the above my Wimbledon full access to all streams came back that I never had other than red button 1 and 2. To exit the hidden menu press on a menu item- the highlight item will disappear, then just press X on your remote. I had previously done a factory reset, reset wifi, changed from straight RJ-45 from router to several new other cables, from 2G to 5G on wifi to personal hotspot on my mobile. Nothing worked until I followed and tried out this posters guide though not relevant to the 4000T it’s the HDR 2000T it still presents the menu without the DRM cache flush, though pressing the hidden menu buttons must have done something, since my FVP 4000T works right after and I’m a happy bunny.

https://hummy.tv/forum/threads/bbc-iplayer-problems.8413/