Action method:
1. Press "Menu key" and click "Settings".
2. Select "Application".
3. "Unknown source" hook, and then you install the required software can be.
None of the above actions can be resolved, please follow these steps:
1. Because the software is compatible, try installing additional software, or restart your phone to install it again.
2. Backup the important data of mobile phone, restore factory setting. ("Application" → "set" → "privacy" → "restore factory settings" → "Reset mobile phone" → "Clear All contents" )
Warm tips:
Some software is installed by default in mobile phone memory, not all programs can be moved to the SD card, specifically with the software developers, the program if the need to install to the memory card, then the software developers need to write the software at the same time to write the memory card installation program. Therefore, whether can move depending on the software itself. (If the software is dimmed and cannot be selected, this software cannot be moved.) )