After update nav screen goes black after a few minutes, help
 

I have a 2004 Z4 it has the MKIV nav with the flip up display. I've been trying to update the firmware to one modded a night mode color set.
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It flashed fine, but now the nav crashes after a few minutes of being on. It did this twice so far, the screen goes black and closes, none of the buttons work, when the car is turned off, the screen flips up then back down.

edit: It was just a dead battery :o