sudo dd if=beini-1.2.3.iso of=/dev/sdX bs=4M status=progress && sync
If your file differs, delete it immediately.
First, "beini-1.2.3.iso" sounds like the filename of an ISO image. ISO files are typically disc image files used for optical discs like CDs or DVDs. Beini might be a distribution or tool, possibly related to networking or penetration testing, given the context of needing a useful feature developed for it. The "beini" name might refer to the Beini framework, which I recall is used for 802.11n testing and auditing.