How can get Android9 source code?

Board based on the Rockchip RK3399 - ARM Cortex-A72 Dual-core up to 1.8GHz + Cortex A53 Quad-core up to 1.4GHz

According to Build AOSP for ROCK960 documentation, if you run the source code of Android9 as below, an error occurs.

cghyun@ubuntu:~/projects/rock960-android9$ ~/bin/repo init -u -b rock960-box-9.0 -m rock960_release.xml
repo: warning: Python 2 is no longer supported; Please upgrade to Python 3.6+.
fatal: manifest ‘rock960_release.xml’ not available
fatal: manifest rock960_release.xml not found

Make sure that you are clear on the difference between a dash “-” and an underscore “_”.

The manifest file you are looking for is rock960-release.xml. — with a dash “-”.

Hello @doitright, solve it . Thank you!!!