How to boot via usb?

I would like some help, I have the sweet potato AML-S905X-CC-V2 and I would like to boot it via USB. I want to install Ubuntu via pendrive.
I’m very confused by what I’m reading on the forum…
Do I just need to update the ufi-bios? Or do I need to use libretech-flash-tool? and do you need to have an emmc module to update the update manager to boot via usb?
I would appreciate it if anyone can help me!

Sweet Potato has onboard bootloader. It can boot to any block device. Flash the USB the same way you would flash a SD card.