diff --git a/11_write_factorytest_by_esptool.sh b/11_write_factorytest_by_esptool.sh
index f4ec148..c308eb5 100755
--- a/11_write_factorytest_by_esptool.sh
+++ b/11_write_factorytest_by_esptool.sh
@@ -4,6 +4,8 @@
 
 # Get esptool command
 BUILD_TOOL=$(lib_get_esptool_command)
+echo "==="
+echo $BUILD_TOOL
 
 # Find port - Cross-platform detection
 PORT=$(lib_detect_esptool_port)
diff --git a/lib.sh b/lib.sh
index bdb8897..9b2d682 100644
--- a/lib.sh
+++ b/lib.sh
@@ -8,21 +8,24 @@
         echo "esptool.py"
     else
     if ! command -v $WIN_PYTHON &> /dev/null
-        then
-            echo "esptool.py nor $WIN_PYTHON could not be found. Please install it first."
-            exit 1
-        fi
+    then
+        echo "esptool.py nor $WIN_PYTHON could not be found. Please install it first."
+        exit 1
+    else
         # check if esptool is installed as a module
         if py.exe -m esptool --help &> /dev/null
         then
             echo "$WIN_PYTHON -m esptool"
             return
         else
-            echo "install esptool module for python first."
-            $WIN_PYTHON -m pip install esptool
+            echo "installing esptool module for python first."
+            bash -c "$WIN_PYTHON -m pip install esptool"
+            echo "Please execute the script again."
+            return
         fi
         echo "$WIN_PYTHON -m esptool"
     fi
+    fi
 }
 
 lib_detect_esptool_port() {