Junction View unlock files - a survey

The JCV is D3060100A.JCV - 787.9MB - and I have no .unl file...

As posted in the other thread
http://www.poi-factory.com/node/40223?page=2 (page 3)

My 2460 does have an unlock code for split screen JCV file D3191090A at 453,916 KB.

Just wondering if the unlock codes are universal for the D3191090A.jcv or user specific. What surprises me that they even have an unlock code for a JCV file.

nuvi 3490LMT CN NA 2014.10
JCV: D3191090A.JCV (464,809,436 bytes)
JCV unlock code present: NO
JCV unlock code location: N/A

nuvi 3790LMT CN NA 2014.10
JCV: D3191090A.JCV (464,809,436 bytes)
JCV unlock code present: NO
JCV unlock code location: N/A

With that information, I'll *assume* that the newer 2013 models could be the only ones that employ a locked JCV file. But at the same time, if Garmin is supplying the ~750MB full JCV file for free download, it is definitely NOT locked. Why would they lock the one provided in the map update package yet still supply the ~750MB JCV file free for download. It really doesn't make any logical sense...but then again, when is Garmin ever logical?

I'll submit my 765T results after I get a chance to update it, maybe later this weekend but I'll assume that it won't have any unlock code associated with the JCV file. This unit also gets the ~750MB JCV file installed automatically.

So far, the only model showing a jcv unl file is the 2460, a discontinued model. As you wrote:

"It really doesn't make any logical sense...but then again, when is Garmin ever logical?"

[Update] DorkusNimrod found a description of a 24xx firmware update that came out earlier this month:

http://www8.garmin.com/support/download_details.jsp?id=5147

Changes made from version 3.30 to 3.40:
◦Fixed an error that caused new maps to fail authentication.

I wonder if this firmware update is connected in any way with this 24xx nuvi series' addition of a jcv unl file.

One way to tell if the JCV file is truly locked would be to rename the unlock file to something like DxxxxxxxA.unl.disabled and see if you still get JCVs or if you get an error message ("cannot unlock") on the unit at bootup.

The plot thickens

Our t923347 reports from another thread:

Both the 3790 and 3597 have a .unl file with the normal split screen JV file that came with 2014.10

This is confusing since we now have two reports on the nuvi 3790 and 2014.10, one with an unl and one without.

http://i923.photobucket.com/albums/ad75/t923347/JCV.jpg

Just checked my 3790LMT that now has the 2014.10 map update and it indeed now has a unlock file in the SYSTEM/JCV directory showing two files named as follows:

D3191090A.JCV 453,916 KB
D3191090A.unl 1 KB

My 3790 has a medium sized JCV file installed by Garmin

D3191090A.JCV 453.916 kb 13/06/2013
D3191090A.UNL 1 kb 13/05/2013

So now I am wondering if the LARGE JCV file will work if the Garmin installed file is named as disabled.
File D3060100A.JCV 769.467 kb 13/06/2013

I can confirm that if you rename the .unl file the Junction Views STILL APPEAR on the map screen. Not sure what good the unl is.

The file you have is only "medium" in size and is exactly the same file as the 769467KB file is, except the large file has full screen views and the medium file has split screen views.

With both the .unl and medium file renamed the large file works just fine on the 3790.

With only the medium file renamed and the unl file with it's orginal name, the large file continues to work fine.

Hi, I have re-installed the 2014.10 maps from the Garmin updater 3 times and it errors out each time,not allowing me to complete the re-install of the maps. I then tried installing from Mapsource, which completed the install to the unit, however, it did not install the new JCV files again. So, I am right back whee I started. To be clear, my old JCV file is th eone with the .unl file included, the newer larger JCV file does not include a .unl file, which may or may not be an issue. I can't seem to even get old JCV file back, even with a new install.

One thought. Does the 3790 use a sleep mode rather than a full power down? Is there a chance that after a full power down and reboot, that a disabled jcv unl will result in a loss of JVs; i.e., that if the unl file is recognized during the current boot up, that disabling the file won't have an effect until a future reboot?

If JVs still remain after a reboot with a disabled or deleted unl file, then we really must wonder what the purpose of the jcv unl file is.

It could be a one-use/one-shot unlock code...once the unlock file is read by the nuvi, it's value could be written to the nuvi's non-user accessible memory area where it is stored. I'm just speculating here...simply because the whole JCV lock/unlock thing is questionable.

1. Why are some of the same series (37xx in particular) of units being given a JCV unlock code after updating maps to 2014.10 while others are not (my 3790 does not have an unlock file)?

2. Why are some map update installed JCVs given an unlock code while the ~750MB file provided for download directly from Garmin does not need an unlock code for use?

3. Why does removing the JCV unlock code (either by deleting or renaming) have no effect on the functionality of the unit's ability to display JCVs? (maybe answered above with my comment about writing the code's value to the unit's memory)

Another experiment would be to rename the unlock code for gmapprom.img and see if this affects the main map file (does it display the "cannot unlock maps" message a boot up?). If it doesn't affect the main map, it can be assumed that the unlock code is indeed being written/saved *somewhere* on the nuvi, beside within the actual unlock file.

The 3790 is "cold" started when removed from the USB cable so it isn't coming out of sleep mode.

Ah, thanks. Then Dorkus' thought of a 1-time update unlocking the jcv file in a hidden portion of the nuvi sounds better and better.

gerrydrake, just look at what you've started!

Still unresolved for you is whether someone else with a 2460 is willing to try the large 750-ishMB JCV full-screen file to see if you're alone with its inability to work or if others are able to make it work.

Good luck.

I also have two older 885T units and never touched the JCV file after installing the new update and Junction View does not even work on either of these units at all.

Just noticed on the screenshot that the modified date time for the unl file is a half hour later than the time the actual JCV file was written to my Nuvi. I wonder if that is significant or not. Like it's written to the device the first time it's booted after the update completes, maybe. That maybe part of what Serg is suggesting.

Just thought I'd mention that Serg(Zak) and DorkusNimrod are one in the same. I've known t923347 for many years now beginning from another forum.

Contacted Garmin on this ,unl file.

Same for me also

You've mentioned already that you've downloaded the new "large JCV file" for the 23014.10 map. If your two 855Ts have the new 2014.10 map, they will benefit greatly by replacing the tiny default jcv file with the large file--note that to use the large JCV file on your 855Ts, you will most likely have to install them to a SD card in the card's \garmin\jcv folder.

The possible reason you say "Junction View does not work" on them is due to the default tiny JCV file not containing JVs for the locations you've driven past. Manually replacing the default jcv file with the large JCV file (3060100A.JCV) on a 855T with the new 2014.10 map may really surprise you.

Not to demean Garmin's Customer Support staff, but unless this question was escalated up the chain, I would not necessarily believe what a Garmin CS agent would tell me about this new finding, at least not right now. Those engineers and others that are aware of issues like this oftentimes do NOT relay their knowledge to first line Customer Support email and phone folks--at least that's what I think.

Well I tried your experiment and was surprised at the results. I think you're right regarding the information is written to "nuvi's non-user accessible memory area where it is stored."

I completly deleted the gmapprom.unl file (of course backed up). I went outside, started and functioned normally.

The I went back in and deleted the gmapprom.gma file.
Went back out, everything normal. I then clicked on a favorite and hit go, told me to go to high lighted road.

So this appears to confirm your suspicions that after the intial boot with the files present it writes them somewhere else (inaccessible) which it then checks to verify.

Good work, you're a genius.

nuvi 3790LMT CN NA 2014.10
JCV: D3191090A.JCV (464,809,436 bytes)
JCV unlock code present: Yes
JCV unlock code location: JCV folder

Removed the split JCV files, and put the full screen on the card. Did a route and the full screen view was shown.

Tried it and the large JCV file does not work on my 855. Just came back from a run on the highway, nothing on the 855 and with the large file on the 3790 a split screen.

I've replied to this finding of your in another thread. The large jcv file does work with a 855 and if you want, we can figure this out.

One quick thought from the other thread. After installing the large jcv and disabling the small jcv file, did you force a reboot of the nuvi by removing, then replacing the battery? The 855 never really turns off, so to force a reboot for the device to identify new files and file locations, you need to pull the battery.

The map update on the 3760 comes with a small Split Screen file (D3192090A.JCV - 158,691) and NO unlock file.

My Nuvi 2597 has a D3191090A.JCV at 443 MB and a D3191090A.unl at 25 bytes

Split-view JCV in the .system/JCV folder:

D3191090A.jcv: 453,916KB and D3191090A.unl too.

I re-did exactly what craigW said and it works like a charm in the 855. Large file on a SD card and the small in the 855 renamed.

As he said AMAZING!!!!

No unlock file on either one of my units after i updated. I would have noticed that since i deleted them before i copied over the large file.

Agreed!

On my 2450 I just have the single D3191090A.jcv file 464,809,436 bytes. No unlock file.

My split junction view works fine. I am running the latest firmware.

Webupdater before you d/l the map.

You could but there really wouldn't be any reason to run Webupdater other than to install a firmware update prior to downloading the maps. Since the map update process will force a firmware update prior to downloading the map files anyway, running Webupdater prior to downloading the maps isn't really required.

Same here. I have the large JCV file installed by GarminMapUpdater.exe.

... Unless you want to use the cloning method to update the map directly on a SD card or thumb drive. In that case, the firmware update would fail on the cloned device and cause the map update to fail. So if using the cloning method for map update, you should run web updater on your device before you start the map update.

Just to be thorough...after updating my nuvi 765T:

nuvi 765T CN NA 2014.10
JCV: D3060100A.JCV (787,933,826 bytes)
JCV unlock code present: NO
JCV unlock code location: N/A

None on my 775, either. Same JCV size (787,933,826 bytes).

I have a 3490LTM and D/L the 2014.10 maps yesterday.

I got JCV File D319090A.JCV (453,916), but I also see in the JCV folder an UNL file.

D319090A.UNL = 1KB.

Never saw one before and it's SOOOO small. ( 1 KB )

What can it be?

The D319090A.UNL is the unlock code for your split screen D319090A.JCV file. The reason it is small is it only contains 25 characters for unlocking the JCV file.

OK.... thanks for the info !

I have a new 3597 and in the JCV folder, all I see is:

D3191090A.JCV (464.8 MB)

No .unl file I can find.

Rob

I have a 2460 and I always use the large jcv file instead of the split screen. In preparation for a trip in a couple of days I just got around to updating my system and installing 2014.10 map.

I was too distracted working on other routing issues to even think about the large jcv files. So I did the install of the map as well as the update and then turned on the unit to make sure things were fine and they were. I did notice when doing a route simulation that the split screen jcv appeared.

I then came to this forum to get the large jcv file and tried to install. This was the first time I noticed in the folder, this new .unl file. I decided to rename both files as I usually do.

After dropping in the larger file, I simulated a route I normally use and notice the junction view was not appearing.

Came back to this forum only to locate this thread. Panic set in, as some have said this unlock code may have been a one time install at first boot.

I decided to remove and reinstall the large jcv file and the renamed files. I ran a different route and it worked. I have the large junction view.

Not sure what to make of this. I will know for sure if things work when I do the trip in a couple of days instead of a simulation.

Hi there...

I have the same 2460 Nuvi and I had the same experience. My 2460LMT also showed 1/2 screen jcv when I simulated the route.

Can you advise "EXACTLY" how you accomplished the installation of the larger JCV file when you said you "REINSTALLED" the larger jcv file?

After the download of the jcv file into my HD first, I normally create the \gadmin\jcv directory on the MicroSD card, then I copy this larger jcv file into that directory.

Then I go into the Garmin Internal HD, \.system\jcv\, then rename the one that was installed by Garmin Express when it got updated.

This is the right procedure, correct? I've used this procedure on my other 1490LMT for the past couple of years and it worked all the time.

I might be wrong but I believe the JCV unlock code was a one time occurrence with the 2014.10 map update.
This is just my theory with the evidence I have at hand.

I have a 2460LMT and an unlock jvc code was added for the split screen jvc file with 2410.10 map (D3191090A.unl).
That unlock code had 25 characters to it and was dated the same date with the map update (6\21\13).

My update for the 2014.20 map was on 8\21\13.
The split screen JCV file also shows that date (D3191100A,jcv).

No looking at the JCV unlock code, the date remained at 6\21\13 and contained the same 25 characters. From this I assume the JCV unlock file was not updated and a unlock code is not required for the JCV file. When you update a map the same gmapprom.unl remains, however 25 more characters are added to that file to unlock the current map. The reason being is that should you revert to an older saved map it will work since the code is still present in the gmapprom.unl file.

Should you want to revert back to the 2014.10 map and it’s corresponding .jcv file, the jcv.unl code would need to be present.
I hope I haven’t confused you and perhaps somebody can jump in and confirm my theory.

Procedure is NOT Correct, the folder on the SD card should be garmin\JCV, NOT gadmin\jcv as you indicate.

If my theory is correct, the process you described should enable you to view the full view junction file without the need of an jcv.unl file providing you change the folder on the SD card to Garmin\JCV
I had tried a full view JCV before the 2414.10 map (no jcv.unl file) and the full junction view worked from the SD card. I prefer to use the split screen.
Let us know if it worked for you.

Ah, correct you are. In trying to help simply1234 in another thread, I checked my 2460 with the new map and saw the jcv, unl and sum files and didn't look closely enough to see that the unl file was for the previous map update (D3191090A.unl used with map 2014.10) and was not connected with the current D3191100A.JCV file for the current 2014.20 map. Thanks.

We'll have to await simply's results to see if the problem is just a folder name issue on the SD card that was easily cured or if there are problems with full-screen JCVs on the 2460 with the current map. Like you, I prefer the default installed split-screen JV display and haven't tried to substitute the manually-downloaded large full-screen JCV file on my 2460 as I still have to do for my nuvi 855.

Thank you for confirming my theory. Why Garmin insists on complicating things is beyond me.

What is accomplished by putting a unlock file on a junction view file. It makes no sense to me. Without the correct unlocked City Navigator map, and a compatible unit with junction view, the junction view file is useless.

Hopefully simply1234 will rename the folder on his SD card and report back the full screen is working.

Edited: CraigW I saw your other post with you trying to help simply1234. In that post he states folder on the sd card is Garmin\JVC (typo?), and this thread it's "gadmin\jcv". I think it's a typo in both threads. He substituted a d instead of an r in gadmin.

I do admit I've done the JVC error in the past myself.