This method works only if the BIOS generates a error code after entering a wrong HDD password 3 times.

1 download hreset.exe

2 create a boot-able USB disk using Rufus and place hreset.exe in the drive.

3 boot the computer and get into DOS mode and enter the following command   ( hrreset   the error code  0; option 2)

4 use the generated code to unlock the hard drive in BIOS (for example, in this case, 4DWTL8L)