diff --git a/Create-DevTerm-A06-OS-image-from-scratch.md b/Create-DevTerm-A06-OS-image-from-scratch.md
index 88c1909..6e2dd6f 100644
--- a/Create-DevTerm-A06-OS-image-from-scratch.md
+++ b/Create-DevTerm-A06-OS-image-from-scratch.md
@@ -22,7 +22,14 @@ cp ~/DevTerm/Code/patch/armbian_build_a06/patch/clockworkpi-a06.conf config/boar
 
 #Then exec ./compile.sh under armbian build
 cd ~/build && ./compile.sh 
-```
+``` 
+
+after image done  
+unzip `linux-dtb-current-rockchip64.db`, `linux-image-current-rockchip64.dtb`  
+and then combine all files ,all the postinst, preinst,prerm,postrm  
+to be one `devterm-kernel-current-cpi-a06.dtb`    
+the reason is if not doing this , `apt-get upgrade` will replace the linux-dto,linux-image* in future, which will cause boot failed  
+so to keep a06 linux kernel in safe , I made devterm-kernel-current-cpi-a06    
 
 # Chroot image
 ```