Mspec, sounds like you had a electrical spike. Consider a protection device, I put a guard on the whole house supply.
They don't stop everything, but can stop/limit spikes from a power cut.

joker, it is possible to upscale standard HD (rec709) content to 4K(2160p) Rec2020 + HDR by injecting HDR into the meta data. At this stage only a few devices can do that. But in time I believe we will see players adding an up-scaling ability other than just 4k (resolution).
The main issue is that most broadcast HD Rec709 is mastered at 100 nits with a gamma curve (EOTF) close to 2.4 or there about's. 4k+HDR is following HDR10 and Dolby Vision are not really standards but a set of guidelines which are still being revised where there is several EOTF functions in use with each having merits. Consequently any device that up scales old imagery HD and older can cause bad issues with luminance levels. Currently most of the 4k+HDR material is split between being mastered at 1000 and 4000 nits. Most of the displays currently roll off as they pass a nominal value towards their peak luminance

Another important factor many don't realize is that 4k+HDR is meant to viewed in darkened environments, not complete blackout but pretty close. The reason is because of our vision where if we view in bright rooms the dark detail will look as though you have black crush. The is the EOTF effect, the curves typically come out of black a lot slower than the old EOTF 2.4 power law, where most displays were set for a 2.2 power law to be viewed in modestly bright living rooms. People with home theatres able to be blacked out typically set for 2.35~2.45 EOTF, closer to the mastering conditions.