diff --git a/How-to-use-the-4G-extension.md b/How-to-use-the-4G-extension.md
index 99ba9f4..93180f4 100644
--- a/How-to-use-the-4G-extension.md
+++ b/How-to-use-the-4G-extension.md
@@ -13,7 +13,7 @@ wait for couple seconds ,then use `mmcli -L` to see if there is a modem like
 
 and if unpack your back shell , you will see a green LED light is flashing on 4G ext
 
-### A06 and D1
+### A06 and R01
 
 run `enable_4g.sh` or `uconsole-4g enable` depends on the version of your os image, both can do the same job