diff --git a/How-to-upgrade-4G-extension-firmware.md b/How-to-upgrade-4G-extension-firmware.md
index e5db828..aa163d1 100644
--- a/How-to-upgrade-4G-extension-firmware.md
+++ b/How-to-upgrade-4G-extension-firmware.md
@@ -1,8 +1,8 @@
 # Precautions
 The following-mentioned flashing operation requires your familiarity with Linux and firmware flashing.   
-**Please do not attempt it without sufficient experience!**  
-**Please do not attempt it without sufficient experience!**  
-**Please do not attempt it without sufficient experience!**  
+**Please do not attempt to try it without sufficient experience!**  
+**Please do not attempt to try it without sufficient experience!**  
+**Please do not attempt to try it without sufficient experience!**  
 
 as we will not be held responsible for any consequences. Thank you for your understanding.