The command prompt window scrolled black text. It was communicating with the phone’s bootloader, bypassing the S-Doc verification that the newer tools couldn't touch.
While you are looking for v.3.0.7, it is generally recommended to download the latest version from the official site (currently v.4.x.x) as it includes all legacy support plus newer security bypasses. octoplus samsung tool 307 download link
Octoplus Samsung Tool is a professional software solution used for flashing, unlocking, and repairing Samsung mobile devices. While version specifically was a major update for the The command prompt window scrolled black text