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  1. #311
    Garmin/GPS Systems GMod. About 37xx converted to 34xx satellites reception accuracy
    About 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracy
    Neil's Avatar
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    @kunix
    I've used it on a 3790 [virgin, never converted previously to 3490]. Functions as a 3490. Identifies as a 3790 on boot. GarminDevice.xml and inventory page show HWID as 1101 so i suppose WebUpdater etc for 34x0 updates is a nono. Logo jumps up and to the right on boot and then disappears when loading maps. Only did the conversion as few minutes ago. I'll take it for a real world road test later and let you know the sat accuracy.
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  3. #312
    Navigation software Moderator kunix's Avatar
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    Quote Originally Posted by Neil View Post
    GarminDevice.xml and inventory page show HWID as 1101 so i suppose WebUpdater etc for 34x0 updates is a nono. Logo jumps up and to the right on boot and then disappears when loading maps. Only did the conversion as few minutes ago. I'll take it for a real world road test later and let you know the sat accuracy.
    You can update it with WebUpdater, but it would just install 37xx GCD which would just erase 34xx firmware. Nothing exceptional would happen.
    I don't know what causes logo disappearance. Some info about how 37xx logo works with 34xx firmware and bootloader would probably help me.

  4. #313
    Garmin/GPS Systems GMod. About 37xx converted to 34xx satellites reception accuracy
    About 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracy
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    Yes, that's what i meant. WU/GE/MD would just dl the 37xx fw and files.

    A bit more info: ASR doesn't work with either ASR 1 or ASR 2 files. I'll play a bit more with that.

    Sat accuracy seems the same as my other convert, varied 4 to 10 metres today in mostly overcast suburban running (no tall buildings) in half-hr test. This unit and my other 2 showed rock solid 3 m before as 3790s which i find to be unrealistic in any case [just artificially enhanced with hotfix?]. From full off, about 4 mins until 'ready to navigate'. From standby 60-70 m quickly backing off to 8/9 m between 30 sec to a minute. I'd suspect hotfix is not working on these converts because while navigating there seems to be no problem, at least with both my 37>34. No car navigator needs 3 m accuracy anyway, imo up to 15m is fine, and i doubt any 'non-pro' receivers truly achieve 3 m constantly in reality without sw and/or SBAS enhancement.

    I'll try a 34x0 logo flash if you want me to, but the logo's really not a problem.
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  5. #314
    Navigation software Moderator kunix's Avatar
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    Ok, so it totally looks like bootloader has nothing to do with GPS accuracy.
    I've spent only about 1.5 day writing gfwpack.exe and I've got an interesting (and probably useful after some modification) piece of software, so I'm not disappointed.
    Last edited by kunix; 1st May 2013 at 07:14 PM.

  6. #315
    Navigation software expert About 37xx converted to 34xx satellites reception accuracy
    About 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracy
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    If we manage to somehow extract from 37xx GPS Fw and add it in 34xx Fw then maybe it will all work OK.
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  7. #316
    Garmin/GPS Systems GMod. About 37xx converted to 34xx satellites reception accuracy
    About 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracy
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    @lolypop000
    As you proposed back in Post #15 and it's timely for it to be raised again after some other seemingly plausible hypotheses have been debunked in practice. Can you help with such a mod?

    Kunix's total rebuilding [it would be trite to call that a 'mod'] of the fw which i tested yesterday is mind-blowing to me. Sure it has a few rough edges which i'm sure he could smooth off quicker than i could make a coffee but it worked overall and seemingly achieved the objective, i.e. to establish if the 37 bootloader would improve accuracy as proposed by Angelozip. I couldn't see that it does during my brief test but have left the unit converted and will do a triple side-by-side with it, a virgin 3790 and another 3790>3490 conventionally converted. Maybe throw in my 3590 as 4th which is as close as i've got to an original 3490. I'll post the results of that soon.

    Kunix, are you prepared to invest a little more time to extract the 37x0 GPS fw and mod it into either the original 34x0 or your creation [or both]? I'm happy to test further, no doubt others will also volunteer.
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  8. #317
    Navigation software Moderator kunix's Avatar
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    Quote Originally Posted by Neil View Post
    Kunix, are you prepared to invest a little more time to extract the 37x0 GPS fw and mod it into either the original 34x0 or your creation [or both]? I'm happy to test further, no doubt others will also volunteer.
    Probably, yes. But are you sure GPS firmware is contained in the unit firmware and not somewhere else?

  9. #318
    Garmin/GPS Systems GMod. About 37xx converted to 34xx satellites reception accuracy
    About 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracyAbout 37xx converted to 34xx satellites reception accuracy
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    No, I'm not at all sure by my own enquiries. I'm only going by what lolypop000 has said.
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  10. #319
    Navigation software expert About 37xx converted to 34xx satellites reception accuracy
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    Maybe GPS FW is in some NVM region and it's only writen in FW, becouse when you convert from 37xx to 34xx GPS FW don't change.
    Already google all for GPS FW, read all post on Noeman but can't find answer where is GPS FW.
    Someone here on Noeman write about region 91 but don't know what is inside this region.

    Do we have UAT FW of nuvi 37xx or 34xx?
    Maybe there we can find answer.
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  11. #320
    GPSPower Helper About 37xx converted to 34xx satellites reception accuracy
    About 37xx converted to 34xx satellites reception accuracy
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    GPS Firmware could also be inside GPS Chip.

    Maybe upgradable by Nuvi
    The difference between stupidity and genius is that genius has its limits.
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