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Hello Check the condition of the battery of your Megellan GPS. Most Megellan GPS batteries will last not more that 40 minutes of continous use after full recharge. Ig battery power is found OK, the firmware of your GPS has the trouble. You ahve to contact nearest Megellan GPS authorised service center to set it right. OK.
If the back button does not work, power off the Approach.
Connect the Approach to your computer and try running the Garmin WebUpdater to load or reload the latest version of software. This will resolve most issues.
Power it back on and try doing a screen calibration by pressing the wrench in the bottom right corner and arrow down and press Calibrate Screen. Press on the dots using a stylus or the round part on the back of a plastic pen.
You may also want to contact Garmin Support for assistance. 1-800-800-1020
No a practical solution, but at least you will get your device repair, after being on hold for 40 minutes I spoke to a very nice rep, unfortunately evethough she didn't admit it, it seems a software problem with the new 2008/2009 map update, in other words no way to fix it, you need to send it for repair, make sure you tell them to update the device with the new 2008/2009 Maps, if not you will have the same problem later on, Good Luck
If you followed the procedure closely, you now have an SD card with your backup on it. The backup consists of two folders: BACKUP, and USBTRANS. Insert the backup SD card in your PC's reader slot and open a "file explorer" aka "Windows Explorer", not to be confused with "Internet Explorer". You will use Windows Explorer to click and drag the USBRANS folder to the Maestro.
With the Maestro 3100 connected to the PC, a couple of Explorer folders will open and you can see the file structure for the GPS in 1, and in the other one a separate file structure for the blank SD card needed for the update. Look at the file structure for the GPS and you should see a handful of folders including "SYS".
Start the upgrade program, following the procedures.
Click the NEXT button at the bottom of the procedures screen.
Immediately copy the backed up USBTRANS folder (and all contents) to the SYS folder on the GPS.
The update should now find the Maestro 3100 and proceed with the update.
SUMMARY: copy USBTRANS (it should contain 1 file: UNIT.DAT)
from your BACKUP SD card (not the one in the Maestro)