Likes: 
Correct,if you have bigger file that original you get error and nothing changes in NVM.
Nuvi work ok.
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Thread: Convert 3790/3760/3750 to 3490
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4th December 2011, 03:38 PM #1Navigation software expert
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5th December 2011, 03:13 PM #2Junior Member
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Ι have try it.
Tnx for the help.
Good job
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8th December 2011, 03:38 PM #3Member
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I have some strange issue after converting 37xx to 34xx.
I've tried to use CNE NTU 2012.30. nuvi shows that map is installed, but when I go to look at it, nothing is displayed.
At the same time when I just use selected regions, it works. I wonder it there is a restriction on .img file size or filename for Unicode maps?
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8th December 2011, 03:45 PM #4Important User
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Have you master resetted it ? (clear non vol)
You have to navigate to get to the good.
Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600
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8th December 2011, 10:01 PM #5Member
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I did a reset just after FW update.
Next thing I've tried, is to split CN Europe Unicode into many small files (1 file - 1 country), but nuvi displays only 2 of them in installed maps menu, and doesn't even show others (I think it shows the first two files from Map directory). An interesting fact that autorouting works between these files.
Any ideas why only 2 maps with same FID are shown? And what is the problem with 2.4Gb file of entire CN Europe Unicode.
I use 8Gb flash card to store imgs.
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8th December 2011, 10:15 PM #6Important User
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I think probably these are issues have nothing to do with conversion, but with how you selected Maps in Mapsource.
Probably some maps borders overlap. In Nuvi ,2 maps with the same FID are shown as just one map-
No problem with CNE NTU map in converted 37xx.
Off topic here
You have to navigate to get to the good.
Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600
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11th December 2011, 06:33 AM #7Senior Member
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From reading here and referred links, would it have been a good idea to backup NVRAM of 37xx prior to making change to 34xx?
Not entirely clear how to do so. I know that ldr.bin and txt file on sdcard can achieve this but unsure of syntax for full back up. Is there more info on this available?
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11th December 2011, 12:46 PM #8voyager56Guest
rrgn,41,1:/41_backup.bin
Originally Posted by fringe
or
rrgn,41,0:/41_backup.bin
First one will write to SD card.
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11th December 2011, 07:49 PM #9Alexander2010Guest
After installing unoriginal firmware good way to clear NV is
ergn,41
But you lose your model number (not big problem)
And NEVER erase regions 05 and 43 - it kill your device.
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12th December 2011, 04:06 AM #10aekhongGuest
Do you mean we all can restore model number back easily after ergn,41 ? Originally Posted by Alexander2010
Which way will you advice ?
How about Unit ID after ergn,41 ?
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I never deleted rgn 41 after flashed (for many times) with other firmware., just did clear NV by menu.
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