Just install succesfully this build on R-TV S10 (S912 - 3G DDR4 ram / 64 Go emmc) using gxm_q200_3g.dtb device tree.
Install to internal done (need to to the operation twice-already notice as possible in the installation guide).
All is fine for now (CEC, SMB, test only on 1080p).
Thanks kszaq