Thanks your come back, How can I install upstream of grub2 in openSUSE, If there is not any packaged grub2 I'm gonna package it for my repo, Interestingly, there is opensuse and opensuse on ZFS as dualboot, opensuse installed in ext4 can see ZFS one while the other one cannot not see it. If there is a replacement for grub2 2.04, I want to try it. Bests,