To unlock your device's bootloader using free commands, you typically need a computer with ADB and Fastboot tools installed and your phone's developer options enabled. This process allows you to install custom ROMs, root your device, or flash custom recoveries like TWRP.

Samsung Devices

The MTK (MediaTek) Exploit: For cheap phones, there is a free tool called mtkclient (Python script) that forces the bootloader to accept unlock commands via a hardware vulnerability. This is truly free, but requires Linux skill.
EDL Unlocks: Emergency Download Mode flashes can sometimes overwrite the lock flag. Tools like edl (free on GitHub) exist, but they are risky.

While the commands are free, manufacturers have built toll booths. Here is how to get the command to work for each major brand.

Unlock Bootloader Command ((link)) Free Site

Samsung Devices

The MTK (MediaTek) Exploit: For cheap phones, there is a free tool called mtkclient (Python script) that forces the bootloader to accept unlock commands via a hardware vulnerability. This is truly free, but requires Linux skill.
EDL Unlocks: Emergency Download Mode flashes can sometimes overwrite the lock flag. Tools like edl (free on GitHub) exist, but they are risky.

While the commands are free, manufacturers have built toll booths. Here is how to get the command to work for each major brand. unlock bootloader command free