What is the and brand of the device you are trying to unlock?
Most files labeled "Unlock Tool Free Fixed" are actually Trojans or Keyloggers. Since you have to disable your Antivirus to run these tools, you are giving hackers full access to your PC.
: Many "free fixed" versions found on YouTube or forums are often unofficial cracks . These may contain malware or be "fixed" only until the tool's server detects the unauthorized access, leading to account bans or system instability.