Dante, I did copy your files to /OS folder and noobs installer done its job. So I had two options to choose on boot: OpenElec and Runeaudio. Too good to be true

Then I was trying to put newest versions of both operating systems (OpenElec and Runeaudio) on USB stick partitions and setting noobs to run OS from USB stick, but without success. So I am switching SD cards till next attempt.