Flashing custom kernel to lg g8 thinq device [closed]

I tring do flash custom kernel to lg g8 device with success,I do the following steps:

1. I downloaded the exactly kernel sources from official lg site
2. Build the kernel according to instructions (README file)
3. Unpack the original boot image (via known script unpackbootimg.sh)
4. Replace the zImage and repack to new_boot.img (via known script mkbootimg.py)
5. Flash the kernel via fastboot ("flash boot new_boot.img")
6. Doing restart

Unfortunately, the operating system does not start up and doing restart again and again.Do I need to disable some features in the kernel ?I see in lg g7 everyone doing this with twrp (wipe partition and doing factory),Do I missed something ?Thanks,