Dear SteeMan, thank you for your answer. I checked Android info, and it shows 8 GB / 128 GB, Android 15, so the advertisement was not real. I investigate it forther.

@quaSimba: Thanks for your remarks and the link to the guide on Github. Hopefully I'll one day have a RPi to work with so I can support it in my script and tutorial. @fxkl47BF: The completion packages were removed because they can be horribly laggy on low-powered SoCs and I find them annoying in general. They can be easily reinstalled if desired.

I have a question about booting from sd card. While with empty emmc (erase with rkdeveloptool), the board falls back to maskrom mode even the sd card (with working os) is inserted. It can boot armbian into sd card if I flash miniloader and u-boot in to emmc. I wonder how can we get it to boot fully from sd card.

Thanks @robertoj I had a quick look at your link. It talks about introducing patches into the Ambien build (which I already do in terms of c code, module source code and the linux .config file). HOWEVER, when I attempt to create a patch from my cpio binary file and use that as the initial ramdisc during the build, it fails (I did it a couple of weeks ago & I can't remember exactly what the problem was). Nevertheless, if you think I can create a patch from the cpio file, please give me detailed instructions and I'll try it again--- maybe I did something wrong?

Unfortunately i do not have this board to compile/test on