Open BigBroActivator and select the "Boot Ramdisk" option. The tool will send the exploit to your device.
Connect your iPhone to your PC and put it into DFU (Device Firmware Update) mode. BigBroActivator-Ramdisk v2 Passcode
Since it boots into a custom Ramdisk, you don't need to pre-jailbreak with tools like Palera1n or Checkra1n. Step-by-Step: Using the Passcode Bypass Open BigBroActivator and select the "Boot Ramdisk" option
Set up the device even if you don't have the original Apple ID. BigBroActivator-Ramdisk v2 Passcode
How to Bypass Passcode and Activation Lock with BigBroActivator-Ramdisk v2