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Use SCBO unlock Apple T2 chip
EFI iCloud Firmware SCBO
1: Get HASH CODE
Press and hold when you see the lock screen:
Next:
Press Simultaneously:
2: Instructions for creating SCBO bootable USB
cp ~/Desktop/SCBO.bin /Volumes/Firmware/.SCBO
cp ~/Desktop/SCBO.bin /Volumes/Firmware/._SCBO
Next:
You need to have USB and other apple computer available to create USB
EFI iCloud Firmware SCBO
1: Get HASH CODE
Press and hold when you see the lock screen:
Next:
Press Simultaneously:
2: Instructions for creating SCBO bootable USB
cp ~/Desktop/SCBO.bin /Volumes/Firmware/.SCBO
cp ~/Desktop/SCBO.bin /Volumes/Firmware/._SCBO
Next:
- Turn off computer locked.
- Insert the Flash drive into the computer.
- Turn on the computer while pressing and holding the Option key.
- You should see the lock symbol for a moment, and then the computer should restart to the Startup Manager.
- If you still see digit "passcode" lock after these steps at startup, reset the NVRAM by holding down Command-Option-P-R while restarting the computer.
You need to have USB and other apple computer available to create USB
This is just an article that introduces the steps to follow, in order to successfully unlock you need to pay more. 
