How to get & compile Android 5.1 for Pine A64-LTS

[tllim]

Hello,

I tested android 6.0 but hdmi output display still 1 min delayed. 
And I think it seem to be not stable.

So I tested android 5.1 and it works that I wanted.

Then I want to get android 5.1 PINE64-LTS source, but i could not find infomation about source of android 5.1(PINE64-LTS, SOPINE)

How to get & compile Android 5.1 for PINE64-LTS ?
(I want 1.1 stable version same as download image site "http://wiki.pine64.org/index.php/SOPINE_Software_Release#Android_5.1.1_.5B20160630.5D")

I visited "https://github.com/ayufan-pine64/android-5.1" but DEPRECATED

The PINE A64 and PINE A64-LTS source are the same.

if you interest to compile the Android 5.1, here is the original source: http://wiki.pine64.org/index.php/Pine_A6...Bv5.1.1.5D

please note that the PINE A64-LTS and PINE A64 different is the system memory configuration and just select LPDDR3 for PINE A64-LTS.