Format the USB disk to a single fat32 MBR partition. Can even be unallocated as long as the partition is MBR. After that use Ubuntu disk writer to write the ISO to the USB disk. Must be MBR to be bootable. Forget about all the flags and other stuff. The disk writer sets them as long as the partition is MBR. Many Debian ISOs have full EFI support now, so if you write to a disk that is not MBR the ISO installer will be written as an EFI/GPT version and then won't boot on non-EFI OSs. You are planning to use LL and deleting Windows so you need MBR on the disk partition you write the ISO to and before you use it the Windows partition must be unmounted by the EFI boot system. Hold the left shift key down continuously until windows is completely shut down then boot the USB on the media channel from the one time boot menu. On some older EFI/BIOS you may need to set to the install OS BIOS setting. This opens the media channel allowing disk writing.
TC
TC
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.