Upgrade mode: 1. First, upgrade the host flight update-13-09-25 _1442 _ j0d.fup (support the summer version of the Kay LiDE project, version number is C2739-M7G 19-). 2. Download the summer data package of 2E23J0D. 3. Delete the NaviOne folder on the host TF card and copy the new Navione folder to the TF card to complete the upgrade. 4. If the navigation doesn't work after updating the new data package, just reinstall the summer version of "C2739-M7G 19". APK”。 Note: This free upgrade is only applicable to Gefei Navigation 3G original genuine map card. Other non-original or formatted map cards are invalid.