Trying to enable the IR receiver on CM3588 NAS kit might need to update device tree overlay.

I purchased a CM3588 NAS kit and I'm running OMV on it. I'm running the OMV image that came pre-installed on it.

I'm trying to figure out how to use the IR receiver. I think I have to update the device tree overlay.

On the Armbian formus I found this info:

Nanopc CM3588 NAS - Armbian

Check or update before upgrade! On your board, edit the file /boot/armbianEnv.txt: Find the line fdtfile="rockchip/rk3588-nanopc-cm3588-nas.dtb" and replace…

www.armbian.com

Check or update before upgrade!

1. On your board, edit the file /boot/armbianEnv.txt: Find the line fdtfile="rockchip/rk3588-nanopc-cm3588-nas.dtb" and replace this line with fdtfile="rockchip/rk3588-friendlyelec-cm3588-nas.dtb", DO NOT REBOOT YET
2. Update your kernel as usual.

But I don't have a /boot/armbianEnv.txt file.

How would I change the device tree overlay?

Thank you.