If you have manually edited an XML file (e.g., to change a VIN or adjust a parameter), the software will reject it if it is no longer "well-formed".
The specific requirements for a RenoLink XML file can depend on the version of RenoLink you are using and the specific tuning or data you are trying to modify or load. However, here are general steps to create a basic XML file that might be compatible: renolink valid xml file