Convert 3790/3760/3750 to 3490

**lolypop000** · 20th February 2012, 04:09 PM

Car "jumping" and satellite problem is also present in original nuvi 3490 with original FW (not converted from 37xx)

aekhong · 22nd February 2012, 01:22 AM

My 34xx is good, no jump. I use separated folders for each 37xx & 34xx.

**ddabcd277** · 22nd February 2012, 09:14 AM

But keep in mind guys that most of the nuvis are not the same - different PCB versions, different memories, diff. info on the regions etc. etc. etc...only God and Garmin knows what else...As I wrote in an other comment "nuvi number is an icon". That easily explains why some people observe such anomalities and others no after the conversion.

Siam, what is the GPS SW version of your nuvi 3750? Have a feeling that the number is not going to be changed after the conversion...

Thanks,

aekhong · 22nd February 2012, 11:00 AM

PCB version is a magic number for me. I have 37xx and pcb is 8.
I did not know why pcb changed to 32 for sometimes of firmware conversion and I got poor reception.
It is fine when pcb is 8. ( at least for me).

34xx is not in my hand now, I will check gps firmware number for you later, ddabcd277. :Animated83

voyager56 · 22nd February 2012, 07:17 PM

Some info on my Nuvi 3790->3490:
My device info:
[Only registered and activated users can see links. ]

GPS accuracy:
[Only registered and activated users can see links. ]

GPS accuracy increased from 20 meters to 6 meters in a few minutes.
I believe it's a quite good accuracy.

**dodontop** · 24th February 2012, 08:19 AM

I have a converted 3790->3490 and I face the problem of reduced accuracy as well. My device however in contrast to voyager56's device is reported as 3790 (PCB ver. 8). Is this of any significance?

voyager56 · 24th February 2012, 08:44 AM

Originally Posted by dodontop

I have a converted 3790->3490 and I face the problem of reduced accuracy as well. My device however in contrast to voyager56's device is reported as 3790 (PCB ver. 8). Is this of any significance?

Probably we can make the first conclusion - PCB version 8 gives poor accuracy, when converted 37xx to 34xx. We need collect more information about PCB version versus GPS accuracy.

**kaspiic** · 28th February 2012, 12:51 PM

Originally Posted by voyager56

Probably we can make the first conclusion - PCB version 8 gives poor accuracy, when converted 37xx to 34xx. We need collect more information about PCB version versus GPS accuracy.

..and "jumping car" when zoomed in or "jumping map" when zoomed out

**catymag** · 28th February 2012, 05:30 PM

Originally Posted by voyager56

Probably we can make the first conclusion - PCB version 8 gives poor accuracy, when converted 37xx to 34xx. We need collect more information about PCB version versus GPS accuracy.

see post 251 here
[Only registered and activated users can see links. ]

I have 10 meter accuracy and it gets 9 satellites from my bed , inside naturally, in my 34xx