Jerky hevc 4k video

on my box GTMEDIA GTC (s509d with 2g ram)
-playback of this 4k hevc video is very stuttering, all 4 CPU cores are on 100%.

Here is movie file description:

Here is kodi log:

In opposite with old LibreELEC-S905.arm-8.2.5-Chroma.422.10bit.img.gz on this device is playback O.K.

Try a clean install. It’s not using hardware decoding due to some sysfs missing or not accessible.

Thanks for reply.
It was a new installation, not an upgrade! It doesn’t make sense without using hardware decoding, indeed.

Make a new installation using another SD card.
It´s not a software issue