"How to get your mac address back after rooting even if u did not wright it down before rooting and u don't need to hook up to pc right step 1 go on market search and look for (es file explorer) install open and go to settings grant it root access and grant wright data then still in settings set home directory as (/) right go out of settings and go to (/system/etc/nv_4319.txt) open with es note editor scroll down until u find #macaddr=(your mac address) and underneath that is macaddr=11:22:33:44:55:66 change this to your mac address exit save and that's it"