If you are the rightful owner of the device, you should use official methods to regain access:

While some versions claim to be free, many "professional" bypass services can cost between $20 to $100+ depending on the complexity. Recommended Alternatives

If you purchased the device second-hand, the previous owner can remotely remove the lock by signing into iCloud.com , going to "Find Devices," and selecting "Remove from Account".

Many "free download" links for tools like HaaFedk are hosted on unverified third-party sites and may contain malware, viruses, or spyware .