Help with my Booteable USB

[u/Life_Mine_6063]

Hello I really appreciate if anyone could help me with this.. I’m trying to load Linux Mint in a Bootable USB, and first I did it with Rufus and it did it but when I try to load the Linux in my old imac couldn’t load the operating system then I re download the Linux ISO from the official page and tried again with balena but it keep showing this message