Thank you friend, I tried this method with some older kernel version, but horizon kernel flasher didn't want to install, it said it only had lkm root. Now everything went exactly according to your instructions.:emoji_thumbsup::emoji_thumbsup:
If I give the command fastboot boot, the system boots up and shows GKI, but if I want to write the kernel with the command fastboot flash boot, it only boots into fastboot. What am I doing wrong? But I have a xiaomi 15 not an ultra