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To perform a Master Reset on the nuvi 300 series, follow these steps:
Start with the device OFF and unplugged from the power source.
Use your index finger to press and hold the top right corner of the touchscreen.
Power the device ON while continuing to press and hold your finger to the top right corner of the touchscreen.
After the device powers ON, release the power button. Then you will see the message: Do you really want to erase all user data?*
When this message displays, remove your finger from the top right of the touchscreen and touch Yes.
The device will now go through the Reset.
Follow the onscreen instructions to set up your nuvi.
the nuvi is set up, if indoors, please go outside to allow the device
to acquire the satellite information. Ensure that the device has a clear
line-of-sight with the sky. *If this message does not appear when
using the top right corner of the touchscreen, please repeat these
steps using the bottom right corner of the touchscreen.
I can't do it for you, but I have done it myself. See the instructions on my webpage at www.dacust.com/nuvi350/index.html. Pictures and everything, along with where I got my battery and the part number, etc. Warning, there are many opportunities to damage your unit doing this. Not for the novice.
There is currently an Update (Vers 5.10) available at Garmin.com Check only the Nuvi 350 click on it and the Nuvi 350 will appear. In the Upper Right Corner you will see a Category of Updates. Click on it and you will be advised that you need to Download UpDater. Do so, uncompress it, then attach your Nuvi to your computer and run Update. It's simple, just follow the instructions on the screen. However, it sometimes take a couple of tries before the Nuvi actually accepts and shows that it has been updated to Vers 5.10 I guess I was lucky. Mine accepted the new update with the 2nd install but it sometimes takes 4 or more. If you are uncomfortable with the foregoing or it doesn't work for you contact Technical support at Garmin. They are really helpful and you can e-mail them at email@example.com