The only working PC I have is a 32-bit x86 and has a minimal Debian installation. I need to flash a USB with an ISO file from it to make a live system. I tried for a few days to get flathub or appimage working there, but just can’t. I decided an apt package would be the easiest course of action, but neither Rufus, Impress or BalenaEtcher seem to be available in default repos. It there a program that is there? A bare .elf executable with no packaging would also be fine.
As others have said,
ddwill work, or if you really want, you can download the x86 Linux AppImage file from Balena’s website, extract it, then just run it (you may need to mark it as executable first). Should work just fine, and it’ll give you the same GUI as always