How to update dtb

hi everyone:i have decompilied /boot/tegra194-p2888-0001-p2822-0000.dtb to dts file and add spi configure such as:

	spi@0 {
		compatible = "spi_dev";
		reg = <0x0>;
		spi-max-frequency = <0x1f78a40>;
		controller-data {
			nvidia,enable-hw-based-cs;
			nvidia,cs-setup-clk-count = <0x1e>;
			nvidia,cs-hold-clk-count = <0x1e>;
			nvidia,rx-clk-tap-delay = <0x1f>;
			nvidia,tx-clk-tap-delay = <0x1f>;
		};
	};

Then,compilied dts to dtb file,copy dtb file to /boot/ and replace tegra194-p2888-0001-p2822-0000.dtb

sync buffer and reboot system,but the system cant load new dtb file;

How far does boot get? Do you have a serial console boot log? Can you post your “/boot/extlinux/extlinux.conf”?

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.
Thanks

Any update? Still an issue to support? Thanks