Custom kernel failed

I build a new kernel with Preempt_RT on my jetson nx ,here is step:

    cd /usr/src/kernel/kernel-4.9
    zcat /proc/config.gz > .config
    ./scripts/ apply-patches
    make menuconfig
    select fully preemptibal kernel
    make prepare
    make modules_prepare
    make -j6 Image
    make modules
    make modules_install  
  sudo cp arch/arm64/boot/Image /boot/Image

when i excute conmand “uname -a”,it’s still old kernel version,it seems new kernel doesn’t work.Is there any wrong step?My L4T version is 32.7.2

There is a known issue in rel-32.7.2 cboot. Need to apply this patch to fix.

Without it, your kernel won’t be read from /boot/Image.

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