REVIEW update after software update"....definitely improves sound quality of dac mobiles like Samsung S9 and clearly changes sound quality to audiophile on Mi poco F1 phone...10% to 20% volume increase than phone on low gain and more than 30% on high gain....after update it's much powerful on High gain....90% volume of M11PRO....Even driving my Sundara & 250 ohm Beyerdynamic dt 1770 pro loud and clear....much powerful like dual dac Daps and NX4DSD...First thing noticed...wider soundstage with needed imaging....Clearer clean forward vocals than...