Meanwhile, I managed to install ArcaOS and it works really fine.
The only limitations I had with my AM4 board is:
- I need a USB Stick for ArcaOS 5.0.2 installation, DVD boot fails
- I have to select "modern hardware, safe mode" in the Pre-Instal menu, only 1 processor supported
- The problem discribed in this thread with the USB stick boot
- To install, you need a Bristol Ridge processor. Not only because of the USB stick problem with Ryzen G, also because you have to update your BIOS before installing the Ryzen G.
I have also installed Windows 10 32 bit, but I have problems since a BIOS update. The behaviour is the same with both processors. After the BIOS update, I cannot reinstal it (I get an early bluescreen aspi.sys error when booting from DVD), and on the installed Windows 10 32 bit installation, I cannot install AMD chipset/graphics drivers anymore and the start menu button is dead when clicking with the left mouse button. Right mouse button works. Searchfield is also dead.