$ python3 extract_dtb.py boot.img
Dumped 00_kernel, start=0 end=8347
Dumped 01_dtbdump_P@0M<@.dtb, start=8347 end=9113600
Dumped 02_dtbdump_Samsung_HEAT_PROJECT_Rev00.dtb, start=9113600 end=9271296
Dumped 03_dtbdump_Samsung_HEAT_PROJECT_Rev02.dtb, start=9271296 end=9429264
Extracted 3 appended dtbs + kernel to dtb