When I tap the Navigation screen the unit flashes to a blue screen called Premium...and that's it. No way to do anything else. I've tried full reset, reset, reload, etc to no avail. The battery is fully charged, the unit powers up and worked ok yesterday, (map issues notwithstanding)today it just goes from navigate to premium. What the heck is the Premium screen and why can't I get rid of it?
I ended up in the same situation and called (800) 421-5013 for help. The gentelman who assisted me said that how the DVD holds the same data
as factory Sanyo 4050 GPS and upgrading has locked your device. To
resolve the discussed issue one have to delete everything (plug-in your
device via USB cable --> My Computer --> Removable disk) and install fresh copy onto your navigation device via that DVD.
Tried it with NO @!@ JOY
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