Garmin StreetPilot c550 GPS Receiver Logo

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Posted on Sep 03, 2007
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How do I clear CMOS?

I bought a locked c500 from a pawn shop and cant unlock it. Noticed several test spots on main board such as uart in, uart out. Can I clear it from the mainboard? I know the factory can but i'd like to. Anyone familliar with these?

  • Aphex Jan 03, 2008

    This is correct. I ended up using it as parts to repair another unit.

    Thank you for your help.

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  • Expert 504 Answers
  • Posted on Jan 03, 2008
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There are only two ways to unlock the unit - The PIN or the location at which it was set. Other than that, it has to be sent back to Garmin. If you have taken the unit apart in an attempt to unlock it, only a tech from Garmin will likely be able to answer your question.

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Garmin Lock works by using either a 4 digit pin code or by taking the unit back to a preset security location. Although Garmin warn that this should NOT be the user's home address, that's what it normally is. If you know where the last owner lived then you can try going to that location to see if it unlocks, but if you knew that piece of information you could just ask the last owner...

It came from a pawn shop though, so it's very unlikely that you know who the last owner was or where he/she lived.

There is no other way to unlock your unit without sending the unit back to Garmin. There's a charge for the service and you'll be asked to provide evidence that you own the unit; in practice it's going to be cheaper to buy a similar brand new Garmin model. All I can suggest is that you try to get a refund from the pawn shop (unlikely!) or sell it to another unsuspecting person.

Sorry, but Garmin Lock is deliberately difficult to overcome otherwise it wouldn't be much use as an anti-theft deterrent.

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