diff --git a/lib.sh b/lib.sh
index 69e5bf4..ddd243f 100644
--- a/lib.sh
+++ b/lib.sh
@@ -89,7 +89,7 @@
             # For Windows, try to detect COM ports
             # Note: This works in Git Bash or similar environments
 	        # echo $OS_TYPE
-            for num in {4..20}; do
+            for num in {3..20}; do
                 if [ -e "/dev/ttyS$((num-1))" ]; then
                     PORT="COM$num"
                     break