Macbook stuck in grey screen when using etcher USB

I am trying to install Proxmox on my old Macbook pro. When I use Rufus or imageUSB to create the install USB it boots into Grub rescue. But when I create the USB using Etcher the macbook is stuck on a grey screen while booting, and when I boot into the boot menu and then plugin the USB the Macbook freezes. Any idea what I should do?

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Hi, did you review the system requirements? Proxmox VE Hardware Requirements

Also, what version of etcher pro are you using? And is the flash successful?

I have the same problem, did you find a solution yet?