maybe you did not change the vid/pid, so the installation process can not find the synoboot partitions.
I should make it clear that you need to change vid/pid BEFORE installation.
PS: DS716/916 should have better compatibility with your hardware, I'll release a DS916 version later when I can test it properly.
A newbie here, thanks Jun and thanks all of you pay effort that made this awesome things happened!!
I was wonder if there is any possible to port this loader for DS716 version?
Since I have a bare machine with N3150 chips, and would be so great if I can have hardware encoding option