how to change proxmox boot from grub to uefi

Hi,

I just upgrade my proxmox server to a new hardware IBM x3650-M5, I used same proxmox boot disk from the old system (older hardware, so it was boot from grub). I have to use legacy bio boot in order to be able to boot from the disk. Here is output for "proxmox-boot-tool status":

root@proxmox1:~# proxmox-boot-tool status
Re-executing '/usr/sbin/proxmox-boot-tool' in new private mount namespace..
System currently booted with legacy bios
WARN: /dev/disk/by-uuid/03D6-7289 does not exist -...

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