Analyze the reason why your installation is not successful, is the installation of the main program downloaded on the memory, the map package is on the SD card, both are not in the same directory; or the version of the main program and the map package version does not match due.

1. Installation location problem. In fact, Keliad navigation in the body ROM is also OK, installed on the SD card is also OK. I usually download and unzip it on the computer first, get a "NaviOne" folder, and then connect to the computer via USB, copy the whole "NaviOne" folder to the root directory of the phone's SD card, and then open the NaviOne folder. NaviOne folder, find the installer ".APK" file and install it.

2. The version of the main program and the version of the map package must match. If they don't match, you won't be able to find the map package or you will be prompted to download the map package even though you have it. For example, if you download the main program through your cell phone, but copy a map package from somewhere else, it won't work. It is recommended to download the program together (both the main program and the map package). If you don't have it, give me an e-mail or Q number and I will send it to you. Note that the cracked version should not be connected to the Internet to upgrade the main program, otherwise the above problems will occur. To update, just download the new full version and reinstall it.

I have installed more than ten phones, all very OK.

I hope to help you, hope to adopt!

I've installed it on more than a dozen phones, and it's been great.