Need help to unlock bootloader

[MeZen81]

After downgrade lenovo k5 note from marshmallows to lollipop and root whit kingroot now i can't find any solutions to unlock bootloader any helps to install twrp volume up not work in fastboot unlock oem commande

 

[MeZen81]

Any help please

 

[MeZen81]

After searching I found a way but I should consult with who would help me
You notice in the video that there are modifications to two system files preloader.bin and uboot.bin system files to unlock bootloader
any helps pleas

question is when write memory with spft
This values not the same k4 note and k5 note ?
Any idea ?