I was with 9.2.3.
But I found the solution :
upgrade NUC’s bios : Download BIOS Update [BNKBL357.86A]
upgrade HDMI’s firmware :
So I swapped my SSD with an old one to install windows 10.
I downloaded the famous HDMI upgrade.
I swapped back my SSD (with LibreElec) and it booted up with good resolution and audio back !