Mac Ventura not recognising Etcher created USB Stick on Power on Boot

Hi there,
I recently Installed Etcher to create a bootable USB stick using Rescuezilla .iso file rescuezilla-2.4.2-64bit.jammy.iso as reccomended by Rescuezilla.

I opened the Etcher app and added the above Rescuezilla .iso file and created the USB bootable stick with no errors. I then shutdown the Mac which has Ventura 13.3.1 OS. Held down the Power button till the boot menu appears, but no USB Etcher stick appears to select and boot from ?

Thankz in advance.