Most free "Samsung MDM Unlock Tool.exe" files circulating on YouTube and sketchy forums are malware. Use open-source (Python) tools or verified commercial hardware.
The MDM lock is stored in the or the Persistent Data Block , which is not wiped by standard user tools. This is where EDL Mode comes in. samsung mdm unlock tool - edl mode
– On Qualcomm-based Samsung devices (most Galaxy A, M, and older S series), you can force EDL by: Most free "Samsung MDM Unlock Tool
Mobile Device Management: Taking Control of Your Business - Samsung Mobile Device Management: Taking Control of Your Business. samsung.com and older S series)
If EDL mode sounds too risky (or your device is Exynos), consider these alternatives: