My friend has a Samsung Galaxy S4 that he doesn't use. He said he would sell it to me if I was able to flash it over. The thing is I don't know how to flash it over. I've done research and I can't seem to find what a "donor phone" is. Can anyone give me all the steps I would need to do this? Also I've tried looking for an msl but it doesn't let me do it I don't know if it is because this phone is 4.3 android instead of 4.1 but if anyone could help me with this as well it would be great help. Also please list the software I would need to use for flashing. Are there any free ways? Also flash it to be able to use full 4g service, multimedia messaging, text messaging, and calling.