Most of us faced BSD Root Error while jail breaking or doing some major change in default OS on your iOS device and it really scares you. You get panic because you see all this gibberish on your device and it just doesn’t stop.
When you restart it and turn it back on, the same white text shows up. The way to fix it is by doing a hard reset and restore back to the previous OS on iTunes.
To perform a hard reset for your iPhone, (see detailed instruction to perform a hard reset on iPhone) you would hold the home button and the wake/sleep button down until it shuts off. Keep holding it down even through start up (when the Apple logo appears).
Finally let go when the “connect to iTunes” screen shows up. From there, restore to old versions and try again!