Help, how to make .img from system vendor and boot files?

[The Even]

i have follow  each and every step as guide told me to do,

from here

https://github.com/android-rpi/local_manifests/tree/arpi-10

https://github.com/android-rpi/device_arpi_rpi4/tree/arpi-10

i have compilled successfully now i have problem with these commonands

# Prepare sd card Partitions of the card should be set-up like followings. p1 128MB for boot : Do fdisk, set W95 FAT32(LBA) & Bootable type, mkfs.vfat p2 768MB for /system : Do fdisk, new primary partition p3 128MB for /vendor : Do fdisk, new primary partition p4 remainings for /data : Do fdisk, mkfs.ext4 Set volume label of /data partition as userdata : use -L option for mkfs.ext4, and -n option for mkfs.vfat # Write system & vendor partition $ cd out/target/product/rpi4 $ sudo dd if=system.img of=/dev/<p2> bs=1M $ sudo dd if=vendor.img of=/dev/<p3> bs=1M # Copy kernel & ramdisk to BOOT partition device/arpi/rpi4/boot/* to p1:/ kernel/arpi/arch/arm/boot/zImage to p1:/ kernel/arpi/arch/arm/boot/dts/bcm2711-rpi-4-b.dtb to p1:/ kernel/arpi/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi4.dtbo to p1:/overlays/ out/target/product/rpi4/ramdisk.img to p1:/


i have run each one correctly but y pi4 didn't boot,
please help me,