Dolby Vision generates green screen after last update 6.6520

[KentACar]

Since the summer of 2018, I have enjoyed movies in full Dolby Vision and Dolby Atmos via Netflix on my Apple TV 4K.

Since the latest automatic upgrade of the TV's embedded software to 6.6520, a few days ago, the screen turns green as soon as I start any material sent in Dolby Vision.

Sony just have to fix this immediately! It is quite obvious that it is this upgrade that has changed something vital and destroyed the possibility of seeing Dolby Vision.

In the mean time I want to downgrade to the previous version, how do I do this?

[KentACar · Accepted solution]

I replay to my own message.

As often before, a factory reset solved the problem.

So, there is a bug somewhere but I am happy now.

My TV is a KD-65XF9005 from summer 2018.