Steve Si

Booting from USB should always be done using the BIOS Boot Selection pop-up dialogue in the BIOS - you switch on the system and press an F key - e.g....

Works OK for me (MBR\Legacy and UEFI64). Maybe you have a bad USB (fake) or bad ISO (corrupt) or bad BIOS?

V4 is legacy version. It does not contain efi boot files.

You need to make the ISO UEFI64 **bootable**. You can't just convert things to an ISO and expect them to be bootable! The easiest thing to do if you don't...

Adding an efi boot file to the directory does not make an iso uefi-bootable. Does the iso boot from a VM as a virtual DVD? My guess is it does...

If anyone has an issue - please state full and accurate details. ISO file name (full exact name) Ventoy version and details of options chosen when making it (Legacy\MBR\reserved space)...

archlinux-2021.06.01-x86_64.iso with Ventoy 1.0.47 boots for me on Lenovo IdeaPad 300 UEFI64 boot. It gets to the root@archiso ~ # prompt just fine using first boot option. I didn't try...

Some bioses have a bug. They do not provide a legacy boot option if there is a fat partition with an /EFI folder on it. In this case, try renaming...

EndeavourOS_Atlantis_neo-21_5.iso boots OK using UEFI64 on Ventoy and grubfm. What exactly is the problem? What system are you booting from? Legacy? UEFi64? etc.

Are you pressing F8 (or F11 or F12 or whatever for your BIOS) to get the BIOS Boot Selection pop-up menu? What choices do you see?