Hi guys lately there was no update on aosp 9 for this device nor of the aosp 8.1 for this device (by cubbins) . I tested both of them and aosp 9 reboots after few minutes but the sound problem has been fixed. Anyone upto build another rom or fix this, I got an lineage os 15.1 source also how is the idea of porting existing lin 15.1 tree of a moto device to xperia m4 with same processor and build one lineage os 15.1?? 
