Likes: 
If you have it in your hands the easiest way is to go to the volume screen, hold the top rhs, go to developer settings then PCB info.
I'm guessing you will find it's 105-02500-00, and the hardware ID appears to be 2002 - but check this before doing anything radical!
It's definitely different to the RV770, mine is PCB 105-03101-00 and hardware ID 2684. This is same as the localised RV775 here in Australia (essentially same PCB with more memory for the included onboard maps.)
I just had a quick look at some firmware for the following devices and at first pass all appear to be different hardware to yours; RV660, Nuvi 67/68, 25x9, 26x9, 27x9, 34xx, 35x7/35x8
You can sniff out more firmware samples here: [Only registered and activated users can see links. ]
Happy hunting
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22nd May 2020, 11:23 AM #1Member +
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24th May 2020, 05:05 PM #2Member
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Dezl 770 PCB 105-02500-00
Nuvi 27x9 PCB 105-02500-00
Camper 770 PCB = DriveSmart 61
Camper 660 PCB = Nuvi 26x9Last edited by wlodekwbw; 24th May 2020 at 05:09 PM.
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