There is currently no known reliable software "bug" or "exploit" that allows a full IMEI-only unlock for newer devices like the iPhone XS and above. Privacy & Fraud:
If you need an academic-style paper , I could help you write a critical analysis or literature review on: icloud bug imei unlocker v40
Are you trying to you've been locked out of, or There is currently no known reliable software "bug"
According to the creators of the tool, the iCloud Bug IMEI Unlocker v4.0 works by: iPhone & Mac - Avast
Software versions like "v40" are often distributed through unverified third-party sites or YouTube tutorials. Users who attempt to use these tools face significant risks: How to Bypass Activation Lock on iPad, iPhone & Mac - Avast