boot -s, zfs mount -a, zfs set readonly=off zroot, comment out kld_load i915kms from rc.conf, reboot, complete make installworld, reboot, git pull /usr/ports, pkg delete drm-kld, portmaster graphics/drm-latest-kld ., enable kld_load i915s in in rc.conf, reboot, did the trick - roughly #FreeBSD#15-STABLE #Solved#KernelPanic