On last thing to remember after downgrading and installing new maps. Time.... It can appear as tho Nav screen is caught in a software re-boot loop. It's not, I've waited almost a 1/2 before. Like a computer that's messed up, screen can even move from side to side like it's stuck. "Software loading" can appear and reappear also. Process again: Downgrade to 4.08 10min. Map update with the 2 files unlocked, 2 hours. New maps trying to load, 20 to 45 minutes.
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