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You're missing the file gmapprom.img on your C510 unit (possibly a failed update?).
Unless you have a backup it's contact Garmin I expect (maybe try getting a copy off someone but possible the file is locked to the unit as I have tried swapping SD cards containing maps in the past between units and no joy)..
No.......the C340 STREET PILOT has a hidden reset button. Put your fingernail in the slot just under the GARMIN name on the front face plate. Gently pull the face plate outward. Don't take it all the way off. The reset button is on the right side of the front screen just under this plate. Use a pointed object and hold the button IN for 3 seconds and unit will turn off. When you power it back up it will REBOOT.
Resetting Your c330 If your unit locks up, press the Power button to turn off the unit, then press again to turn the unit back on. If this does not help, reset your C330. 1. Place your thumb nail in the groove located under the Garmin logo on the face plate. 2. Gently pull off the face plate. 3. Press the Reset button. 4. Turn the unit back on; it will operate normally