diff --git a/scripts/upgrade b/scripts/upgrade
index 57a80d7..cb059e5 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -14,6 +14,22 @@ ynh_script_progression --message="Stopping $app's systemd service..." --weight=1
 
 ynh_systemd_action --service_name="$app" --action="stop" --log_path="/var/log/$app/logfile.log"
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+ynh_script_progression --message="Ensuring downward compatibility..." --weight=1
+
+if [ -d "$install_dir/endi" ]; then
+    ynh_secure_remove --file="$install_dir/endi"
+fi
+
+if [ -f "$install_dir/endi.ini" ]; then
+    ynh_backup_if_checksum_is_different --file="$install_dir/endi.ini"
+    mv "$install_dir/endi.ini" "$install_dir/caerp.ini"
+    ynh_delete_file_checksum --file="$install_dir/endi.ini"
+    ynh_store_file_checksum --file="$install_dir/caerp.ini"
+fi
+
 #=================================================
 # INSTALL NODEJS
 #=================================================