You need to remove the 2 screews from the bottom and then gentley prize the unit apart from teh bottom using a blunt broad knife will help if you cant have the plastic case splitting tools which are used in the trade,
then once apart the same side where the power button is you will see a microsd card its the same as in a mobile phone just pull it down from the top (its hinged at the bottom) then make sure the card is in correctley and then close it back and test (b4 putting the case back on) that will fix it we ahve a lot of these coming in and its where its been dropped etc and jumps out thats it
Even Windows 7 cannot find device driver software,its not suppose to be this difficult to resolve..I even purchased a replacement lithio battery,the bigger internal black one that plugs into the other socket...even that didnt help....there should be a website operated by Navman where customers can go to download device driver software & update maps..if this company wishes to keep a loyal following for its customer base?
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This is not an uncommon error and is mostly referred back to Nab=vman for repair
Other than sending it to Navman you can...Open up the unit (this voids any and all
warranties you may still have and if you go with this option forget
about contacting Navman). F20's internal flash is just a hidden micro
SD card. If you don't have it already, you'll need to get a cheap micro
SD card adapter -- with it you will be able to read the card with any
card reader. You could then scan card for errors and look for log files
that could provide more information on what went wrong with your unit. Please rate my help++++Thans for using FIXYA
The internal memory on the F20 is actually an mini SD card inside the unit and this fault is caused if the card can't be read. This is mostly likely because there is a poor connection to the card. To cure the problem:
1) Remove the two screws on the bottom of the unit.
2) Divide the two halves of the case. Its best to do this by using your finger nails or a plastic lever. If you use a screwdriver or something similar you will most likely damage the case. Take care when you finally are able to divide the two halves of the case not to strain the cables connecting the battery and loudspeaker.
3) You should be able to see the SD card in its holder on the circuit board. To remove the SD card pull the top edge away from the board and the top half of the holder should hinge outwards. Don't try to pull the card out as you would do from a normal external SD slot.
4) Examine the terminals for any corrosion or contamination. In most cases just removing and re-inserting the card does the trick. You can safely switch the F20 on with the case still open, but don't attempt to insert or remove the SD card with the F20 turned on as this may damage the circuitry.
5) If this doesn't solve the problem the card itself may be corrupted. You can check this by inserting it in a computer card reader to see if it can be read that way.
I think that the micro SD card inside the GPS is not in the good position, it is necessary to remove the grey sticker on the rear of the GPS and open the hood to access the SD card and then you can plug it in good position.