Xbox 1 need flash mediaplayer updating say this website: http://areena.yle.fi/tv [It not work ...

Probably never, and it has never been an option to install flash on an Xbox system. In this day and age there are to many good reasons why one should not install flash onto their system.

I downloaded the OSU2 file from Xbox onto a flash drive. Unplugged the power cord, put the flash drive in and held the bind and eject buttons, then turned the xbox on again, didn't work like the website said. Then I restarted my console with the flash
drive still in, update is working now. Might be the trick to getting this to update. Still, why do they send out updates that 1, don't need to be sent and 2, just screw up our systems??

Looks like some digital zoom - maybe monitor/tv own upscaling doing a poor job.

I would look for firmware update for tv - first thing.

Maybe I am wrong in that mediaplayer/console must have it's own upscaling for 4k stuff to do a good job.

Yes and no

Yes it will still work as a browser but only for depreciated sites

Anything that needs current standards or certificates then no

Depreciated sites only

Basically if your websites says update your browser then only updated browsers can run it

You will be hardpressed to find depreciated sites maybe archived websites

Streaming sites that don't use flash instead html5 won't work since ie wouldn't have the necessary certificates

Maybe im not understanding you right, but here is how i have mine setup.

I have WD-MediaPlayer, Bluray, Xbox360 and Xbox One connected to my reciever via Hdmi.

My TV decoder is input into the Xbox One.

My reciever outputs all to my TV via Hdmi.

This setup works great, as i can easilly switch any device with one remote.