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You can customize and test new dtb/dtbo file without the use of using external resourceresources, you just need the seco SECO board, and a PC (windows Windows or Linux) for connecting to it with ADB protocol (via USB cable or over IP).
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Connect to the board via ADB protocol (ref to Connecting via ADB for details) or via Serial cable
Enter in the folder /data/seco/dts_source:
cd /data/seco/dts_source
Inside “seco/” folder you will find the dts sources files you can modify and compile for changing default dtb or dtbo
Here is an example from c43 board:
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