Check out this video tutorial to understand the process : https://youtu.be/fG-0CFG284A
1. Connect your device to pc and open tool
2. Wait till you get pop up that device is supported, then register it
3. Make sure your device is iOS 15.5 or 15.6, if not flash it with iTunes or 3uTools
4. Do Jailbreak like checkra1n steps, When jailbreak Done close iRa1n and open iRemovalpro again.
5. Now you will get device check message is supported for Bypass with signal or not.
6. If supported, then Go and order on web on device service model.
7. Close and re-open after registration, then click on Activate.
8. When process finished, message saying activation DONE and device will auto reboot.
9. Done