1. First download and install the pp assistant, and open the pp assistant. Dangke Software Park provides software download.

2. Then, search for the software you want to download in the search interface.

3. Click the software icon to enter the detailed interface, and then pull to the bottom. Click Version History and select the version to download.

4. Each version has an update time, depending on the date when you need the old version, but please uninstall the new version before downloading.

Android is a free and open source operating system based on Linux kernel (excluding GNU components). Mainly used in mobile devices, such as smart phones and tablets, led and developed by Google and open handset alliance. Android operating system was originally developed by andy rubin, which mainly supports mobile phones.

The original meaning of the word Android refers to "robot", and it is also the name of the open source mobile phone operating system based on Linux platform announced by Google on June 5438+065438+1October 5, 2007. The platform consists of operating system, middleware, user interface and application software.

The Logo of Android was designed by Ascender Company and was born on 20 10. Its design was inspired by the graphic symbols on the men's and women's toilet doors, so Brock drew a simple robot with a trunk like a tin can and two antennas on its head, so the Android robot was born. The characters in it use the font named "Droid" specially produced by Ascender Company. Android is a robot with a green body, and green is also the symbol of Android. Colors are drawn in RGB by PMS 376C and hexadecimal #A4C639, which is the brand logo of Android operating system. Sometimes, they also use plain text signs.