It is impossible to upgrade through official channels. The signature version of Gaode map refers to the unofficial modified version of Gaode map application. This revised version is usually not officially supported by Gaode Map, so it cannot be upgraded through official channels. The truly official Gaode Map application is developed and maintained by Gaode (the parent company of Gaode Map), and users can download and update it through the official app store or official website. For the genuine Gaode Map application, you can use the official upgrade function to get the latest version of functions and fixes.