@Rob Loan I am sorry my English really poor.
* At first we try to boot a kernel via grub rescue, but it doesnt work -> ls (hd0,gpt1), ls (hd0,gpt2), ls (hd0,gpt9) shows "unknown filesystem"
* Second: We try to repair a grub via PVE install iso -> chroot->mount /dev,/proc, /sys etc.->...