qbap/a7-ios7-downgrader — reverse-engineered prompt

Build me a macOS command line tool called Semaphorin that helps someone downgrade, dual boot, and jailbreak supported older iPhones and iPads using seprmvr64. It should be meant for owned devices only, with clear warnings that it wipes the phone, backs up required device files first, and does not bypass Activation Lock or Setup.app.

The flow should be simple. The user connects an A7 to A11 device in DFU mode, runs the script with the iOS version they want, like 9.3 or 10.3.3, and chooses restore or boot. The tool should check requirements, macOS Catalina or newer, Intel Mac, Java 8, enough free space, internet, and a USB A Lightning connection. It should guide the user through entering their current iOS version, downloading what it needs, restoring, rebooting, and then explain how to jailbreak after the downgrade depending on the iOS version.

Please include helpful troubleshooting text for common issues from the README, and keep it safe, clear, and hard to misuse.