After yesterday's [Only registered and activated users can see links. ] (which turned out to be a ghost hunt), here's another challenge.

On eBay I also bought a nuvi 765T (FW 4.50, HWID 0870). This device has prior to the sale been used by a car rental company, illustrated by the splash screen on startup. I've been trying to get the device back to factiory default, but I can not get rid of the Hertz splash screen, not can I get the "Go Home" option back in the "Where to?" menu. See screenshots below.

What I have tried so far:
1. Hard reset (finger on right hand lower corner of screen during start up).
2. Flashed FW 3.60 via WebUpdater, rebooted (Hertz splash screen still present), shut down, reflashed FW 4.50.
3. Deleted custom POI files. This only removed the customized "Where to?" options.

Any other suggestions how to get rid of the Hertz customization? I do have another nuvi 765T (HWID 0870) from where I could copy data, if that is of any help.

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Mass Storage Mode

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boot up - part 1

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boot up - part 2

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boot up - part 3

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boot up - part 4

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"Go Home" option missing

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"Go Home" option present (example from other device)