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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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fussballclub
Is your GPS screwed? Is the map on an SD card? Do you have a copy of the map/card?
You could backup the device/card and then try formatting if you think the copy is ok. You can also download the base files required for an 800/810 and then put your own stuff back in manually.