I have sm-L305u and sm-L705u firmware, but I don't have the others, I think we can exchange each other. I need sm-r915u/n/f, sm-925, sm-950,sm-955,sm-965,sm-L300,sm-L310,sm-L315, we can exchange any of the above firmware. In addition to the above models, other firmware I have, can also exchange.