Help with grub booting USB

I have an older MacbookPro i believe an 08 model. I have installed ParrotOS Security on metal. I have now wanted to swap back to Kali but when I put the USB in it to install Kali, the grub bootloader does not show Kali drive or my USB thumb drive. I have tried to use BalenaEtcher and also Rufus and neither will show in the grub loader. Can someone help me find a way for Grub to load the thumb drive so i can select at boot? Thanks!

Parrot Version 4.10

then how did u boot parrot usb?
though i didn’t know grub would even display bootable usb, instead enter bootloader n boot your usb

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