I want to change my default device-tree, can I boot image with separate device tree binary?

I want to modify my device-tree and test it.
the generated boot image is appended by dtb file, can I generate separate dtb file and update it only?

Or will it be better to generate whole boot-image and flash and reboot ( for dragonboard 845c )

I’ve never used it on 845 but you can certainly use dbootimg tool for that:

The command could be something like:

cat my-custom-dtb | dbootimg /dev/disk/by-partlabel/boot -u dtb

let me know…

Dbootimg, thanks, I’ll look for its doc