Use SCBO unlock Apple T2 chip
EFI iCloud
Firmware SCBO
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1: Get HASH CODE
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Press and hold when you see the
lock screen:
Next:
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Press Simultaneously:
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2: Instructions for creating SCBO bootable USB
cp ~/Desktop/SCBO.bin /Volumes/Firmware/.SCBO
cp ~/Desktop/SCBO.bin /Volumes/Firmware/._SCBO
Next:
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.
After EFI is removed use your own Bootable OS X and install it. First installation don't do over WiFi.
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. 