How to re-load new dtb file

hi everyone:i have discompiled tegra186-quill-p3489-1000-a00-00-ucm1.dtb to dts file
changed configuration and re-compiled to tegra186-quill-p3489-1000-a00-00-ucm1.dts
Then copied and replaced dtb file in /boot/

but the system cant re-load new dtb file after reboot system

The device tree by default is read from the partition. So modifying it and put to /boot will not take effect.

You can directly put back to your host, make sure the board config will use this dtb and flash the board again.