diff --git a/upgrades/from_any_to_5.3.8/upgrade.sh b/upgrades/from_any_to_5.3.8/upgrade.sh
new file mode 100644
index 0000000..ee27f16
--- /dev/null
+++ b/upgrades/from_any_to_5.3.8/upgrade.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# Script designed to upgrade PNETLab from almost any version to NEW_PNETLAB_VERSION version
+# Requirement: Not having PNETLab 6.x installed for being able to upgrade to NEW_PNETLAB_VERSION
+# This script avoids to make this upgrade process twice
+
+# CONSTANTS
+NEW_PNETLAB_VERSION=5.3.8
+GREEN='\033[32m'
+NO_COLOR='\033[0m'
+URL_ZIP_FILE=https://unetlab.cloud/api/raw/?path=/UNETLAB%20I/upgrades_pnetlab/from_any_to_$NEW_PNETLAB_VERSION/$NEW_PNETLAB_VERSION.zip
+
+# Getting PNETLab version from db
+data=$(mysql -uroot -ppnetlab -D pnetlab_db -e "SELECT control_value FROM control WHERE control_value>1;" 2>/dev/null)
+pnetlab_info=($data)
+pnetlab_version=${pnetlab_info[1]}
+
+if [[ $pnetlab_version == $NEW_PNETLAB_VERSION ]]; then
+    echo "PNETLab already upgraded to v$NEW_PNETLAB_VERSION. You can´t upgrade twice"
+    exit 0
+fi
+
+if [[ $pnetlab_version == *6.* ]]; then
+    echo "It is not possible to upgrade to $NEW_PNETLAB_VERSION having version 6.x"
+    exit 0
+fi
+    
+echo -e "${GREEN}Downloading $NEW_PNETLAB_VERSION zip file...${NO_COLOR}"
+wget --content-disposition -q --show-progress -O /root/$NEW_PNETLAB_VERSION.zip $URL_ZIP_FILE
+echo -e "${GREEN}$NEW_PNETLAB_VERSION zip file has been downloaded successfully${NO_COLOR}"
+
+cd /root && rm -rf upgrade
+
+echo -e "${GREEN}Unzipping zip file...${NO_COLOR}"
+unzip $NEW_PNETLAB_VERSION.zip -d ./upgrade > /dev/null 2>&1
+echo -e "${GREEN}Zip file has been unzipped successfully...${NO_COLOR}"
+
+chmod 755 -R upgrade
+find upgrade -type f -print0 | xargs -0 dos2unix > /dev/null 2>&1
+
+echo -e "${GREEN}Upgrading to v$NEW_PNETLAB_VERSION...${NO_COLOR}"
+./upgrade/upgrade
+echo -e "${GREEN}Upgrade to v$NEW_PNETLAB_VERSION has been done successfully${NO_COLOR}"
+
+rm -rf upgrade
+#rm $NEW_PNETLAB_VERSION.zip
+
+echo -e "${GREEN}PNETLab VM will be rebooted right now...${NO_COLOR}"
+echo -e "${GREEN}Try to connect again in about a minute${NO_COLOR}"
+reboot