Care to give it a spin? Download at no cost:

(netboot image refreshed on September 13, 2021)

ISO: Metztli Reiser4, Software Framework Release Number (SFRN) 4.0.2, Debian 11, Bullseye. : SHA256SUM

Metztli Reiser4 kernel configured for AMD Epyc/Ryzen:

(netboot image refreshed on September 13, 2021)

ISO: Metztli Reiser4 Z, Software Framework Release Number (SFRN) 4.0.2, Debian 11, Bullseye. : SHA256SUM

Once downloaded, image can be 'burned' to USB device as:
dd if=metztli-reiser4.iso of=/dev/sdb bs=4M; sync

or for AMD Epyc/Ryzen:
dd if=metztli-reiser4-z.iso of=/dev/sdb bs=4M; sync

(CAREFUL: device at /dev/sdb will be rewritten)

Note: Metztli Reiser4 Debian Bullseye -based preliminary netboot images are not yet available at Sourceforge

NO IMPLICIT NOR EXPLICIT WARRANTIES.