its a simple tool which extract boot.img and it doesn't extract the whole rmdisk.. so u can easily port ColorOS, YunOS etc boot.img
GUIDE:
1. extract the tool
2. copy port boot.img
3. open start.bat
4. press 1 to extract
5. keep rmdisk in a new folder
6. extract stock boot.img
7. copy the kernel
8. now join them by pressing 2
Mainly you have to use port rmdisk and stock kernel...... ENJOY!