In M30s facing more eating issue while the playing the game as well as charging and also using the some applications Samsung help us 

One ui can use for all Samsung J series a series C Series download the link is given below after the download simply install  it then go to the themes and apply the themes then you can easily enjoy the one Uihttps://drive.google.com/file/d/1IpyGEjzaW...

Hello friends there is no more OS update for Samsung Galaxy j7 16 and j7 Prime sorry to say you but Samsung policy for update has been completed for this device and there is a quiet chances to get security patch