Strange error. Update/Downgrade not working

[F150Chief]

Is this a NON-NAV unit or do you have maps? If you do not have maps, please read this thread…

Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4

Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version. Read this document fully before starting any actions. It is your responsibility to follow the instructions as outlined below. (DO NOT USE REFORMAT ON 2020 AND ONWARD VEHICLES) General This tutorial covers the scenario where a NON-NAV APIM with Sync 3.4 installed and will not update to a newer version of Sync 3.4. This is not the same as upgrading from previous versions of Sync (3.0) to Sync 3.4. It is assumed that you have tr…