How to Remove GPIO usage in device tree

I am not able to locate device tree files in jetson nano developer kit .
getting this kind of error .

can somebody help me ?

Hi Dnyaneshwar_3D,

Please enter into /boot/dtb on your board first.
and run dtc command with sudo.

Getting this kind of result how to proceed further

how to get this files :- tegra210-p3448-0000-p3449-0000-b00.dtb
steps for SPI loopback test:-

from this i am not able to proceed further can anybody explain in detail:-
2-2. Remove GPIO usage in that device tree

There’s no space between kernel_ and tegra210-p3448-0000-p3449-0000-b00.dtb and you should run this command in /boot/dtb on your board.

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