Nuvi 770 saying "Can't Unlock Maps"

r21442 · Occasional Visitor Joined: Jan 19, 2008 Posts: 16

Nuvi been in the car all winter. Put it on last night and came on OK, seemed unable to get sats and some favorites were missing. Tried a few on/offs. At one point it asked what country I was in - never done that before. Eventually it said can't unlock maps. Don't see much in manual. At one point my 8 yo was pressing icons - could he have screwed it?

Help!

r21442 · Occasional Visitor Joined: Jan 19, 2008 Posts: 16

I should add that Garmin lock is off and I tried the slide the power button for 8 secs to reset.

PhilHornby · Last edited by PhilHornby on Wed Jan 19, 2011 1:54 am; edited 1 time in total

For whatever reason, (flat battery, interrupted boot, who knows?), it's lost its map unlock code file(s). For some reason, this is deleted when the unit is shipped - it doesn't usually matter, 'cos it's only read once - except when this happens.

Given that the 770 has Europe & North America maps, you've presumably lost both codes, for it to give this message.

You can confirm in "Tools | Map | Map Info".

You need to enter the codes in \Garmin\GMAPPROM.UNL and \Garmin\GMAPPROM1.UNL (not sure which is which on that unit). The code takes the form of a 25 digit number and is entered without spaces (use Notepad or similar).

If you don't have the codes, you'll have to get 'em from Garmin - either by phone, or by registering the unit at http://my.garmin.com

r21442 · Occasional Visitor Joined: Jan 19, 2008 Posts: 16

Thanks Phil - a discharged battery may have accounted for it? Anyway, I looked in the folder you ref and don't see any .UNLs in there. I brought up my backup on my PC and the contents look identical. No .UNLs?

I accessed Garmin. I don't remember having seen before the connectivity tools? Plugged in, logged in, recognised and offered me a firmware update which I accepted. It ran OK but I'm still map locked. I see my maps & code on ther site but how hard do they make it - why oh why not a simple button to re-unlock when the tool has clearly talked with and recognised my registered product? Searched their FAQs but keeps going round in circles offering me new maps which I'm bu$$ered if I'm buying! I've raised a ticket with them.

PhilHornby · Posted: Wed Jan 19, 2011 1:53 am Post subject:

r21442 · Occasional Visitor Joined: Jan 19, 2008 Posts: 16

Phil,

I got excellent & prompt support from Garmin which tbh was a surprise given what I'd read elsewhere. It turned out the missing .UNL was the problem and the fix. Interestingly, they sent just one UNL with both map unlock codes in. Didn't know to do that.

Thanks anyway. Every day a school day!

PhilHornby · Posted: Sun Jan 23, 2011 4:33 pm Post subject: UNL filename

Burn180 · Regular Visitor Joined: Sep 02, 2007 Posts: 117

Depends what Garmin you have. It will be

gmapsupp.unl (or)
gmapprom.unl

.unl being the extention
_________________
Garmin Nuvi 3790T Firmware 4.30
Also Owned
Garmin Nuvi 200W, 760, 770, 765T

PhilHornby · Posted: Tue Jan 25, 2011 3:07 pm Post subject:

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