a simple fix, i just dumped the emmc of a clean beaglebone, just dd or use win32diskimager to put it on an SD card and pop it in the beagle, by default itll boot from the SD so should avoid the hack completely, i dont have a hacked unit myself so i cant be 100% sure but it should work. heres the link:
https://mega.co.nz/#!sVcjFJqY!4vvOsdQBqNjzalfsmCzFlntjy4INlH1HqLEJPvXE6DI