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If i install t4a my mapsource does not work

I downloaded the latest vesion of mapsource on my computer, but now my T4A does not want to work It says there is a problem with the T4A-8001 installation. But it work just fine before i downloaded the new mapsource. I already uninstall T4A and install it again, but it still doesn't work. can you please help me?

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Posted on Jan 02, 2017

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SOURCE: blue chart pacific v8.5- mapsource

Try skipping the installation wizard and use your coupon code to unlock the maps/GPS online at Garmin's website. 

Also if you downloaded the mapsource software online, the download may have been corrupted.  You may have to contact garmin tech support to try another download.

Posted on Oct 26, 2007

  • 4090 Answers

SOURCE: Mapsource doesn't open.

usually by installing the maps!

Posted on Jun 23, 2009

  • 24 Answers

SOURCE: USB driver installed but not finding unit

Check the 6 phillips head screws that hold the front and back parts of the case together. If you have ever had the battery changed and the screws were not snugged down all the way, the USB connection on the back may not be making contact with the circuit board inside the GPS. If the screws are snug, then you may need to take the unit apart. If you are comfortable with this, removed the 6 phillips head screws. CAREFULLY pull the front and back parts of the case apart. There are wires holding the two halves together so handle these parts carefully. Looking inside at the circuit board, there are some small circuit trace pads (about 4-5 or so), in the area where the USB port would line up. Use the alcohol and q-tip to gently clean these pads and also the little spring connectors on the other part of the case. Carefully, reassemble the case. There is a rubber gasket that fits between the two parts of the case. Make certain it is not kinked or crimped. Gradually snug down each of the 6 phillips screws, working your way from one side of the unit to the other and criss-crossing. You may need to use your fingers and pinch the unit together as you snug a specific screw. When the unit is reassembled, try the USB again. If it still does not work, it may need to go back to the factory.

Posted on Jan 23, 2010

  • 6993 Answers

SOURCE: my Garmin is 255 minus the W-I have on my desk top


Read through the manual on the below link:

If that was not helpful, follow the below procedure since you have successfully downloaded the map:

  • Launch the web browser with Garmin Communicator installed.
  • Navigate to the MapQuest website.
  • Select the "Directions" tab.
  • Enter your "Start" and "End" destinations, then click "Get Directions."
  • Edit the directions to fit your needs. You can drag the navigational line to adjust the turn-by-turn directions, remove highways from the directions and add additional destinations as needed.
  • Connect the Nuvi 255W to your computer using the appropriate USB cable.
  • Click "Send" located above the map interface.
  • Select "Send to GPS."
  • Click "Send" to transfer the map data to your Nuvi 255W. The MapQuest data will be saved to the "Favorites" section of the Nuvi 255W.
I hope you are able to get back on track now.

Good luck.

Posted on Oct 28, 2010

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