To flash firmware using this tool, follow these general steps found on forums like Hovatek : : Open the QcFire module.
Note: While the tool itself is often paid/licensed, there are trial versions of 6.3 floating around. However, investing in a license ensures you get virus-free updates.
Not all. It can unlock the bootloader on many Xiaomi devices directly in EDL mode. For other brands, the capability depends on the specific device and its security implementation.