Hi just got my new mx4pro,coming from a oneplus one,bought it mainly for the quality of the audio o/p and have not been disappointed,great online music store digging a lot of the chinese stuff,but dont seem to have a stock music player installed,i am on 4.1.1,should i go ahead and down load the latest firmware what will i lose gain
Well basically you are using a very old firmware as you might have found out yourself.
The new firmwares are based on Lollipop.
So basically you do not lose anything.
P.S.:I recommend to upgrade to due Stagefright.
Maybe our FAQ section can help you upgrading: