Convert back dtb to dts file and dts to dtb

dtb to dts:

Method-1:
 
$KERNEL/scripts/dtc/dtc -I dtb -O dts -o <dts_file> <dtb_file>

Method-2:
 
fdtdump <dtb_file> > <dts_dump>
fdtdump command is part of device-tree-compiler package, install as below to get:
 
sudo apt-get install device-tree-compiler

dts to dtb:
$KERNEL/scripts/dtc/dtc -I dts -O dtb -o <dtb_file> <dts_file>