Hmm. The latest TW kernel-firmware package contains 20.40, so this should have triggered the same problem. Could you confirm the following? - Remove /lib/firmware/updates/* - Install again the latest TW kernel-firmware (20201008) - mkinitrd and reboot If this shows the boot problem, try to put picasso 20.40 firmware again /lib/firmware/updates, mkinitrd and retest.