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  1. #121
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    aekhong's Avatar
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    Quote Originally Posted by Kanopus View Post
    I have gotten then "system software missing". I was able to turn nuvi off, but after start again software missing. I have flashed TW 2.50 for the second time with no change. Now I have returned to EU/US firmware. I have checked tested regions and found no changes.
    3790 SgMy can be flashed with original 37xx US firmware / hwid 1288--> chnged to 1101., boot up normally / but can't be flashed to sgmy again.
    GPS Lover.
    974c07a6a129e2e0917a011314c2c0bd

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  3. #122
    Navigation software expert Kanopus's Avatar
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    Can you check region 34 in this nuvi? Maybe this is similar case like turboccc described.
    Thanks, Kanopus

  4. #123
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    Quote Originally Posted by kunix View Post
    The condition of not rebooting inside this asian firmware is the following:
    (region34.hwid == 0x4EB AND region43.hwid == 0x4EB ) OR region34.hwid == 0xFFFF
    So it's enough to copy both region34 and region43 from asian device, but you'd better don't do it, because region43 is x-loader, so you can brick your device in the most reliable way
    The better solution is to set region34.hwid = 0xFFFF. region34.hwid is placed in two bytes at offset 0x10.
    Also turboccc's 3750 works fine because is has region34.hwid == 0xFFFF.
    As far as know UnitID is copied from region 41 to region 34. I guess it happens only when UnitID in region 34 is erased or modified (maybe I'm wrong). Is this also applicable to HWID? I mean if HWID will be changed in region 34 will it remain changed or will it be overwritten from region 41?

  5. #124
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    Quote Originally Posted by kunix View Post
    Which asian firmware did you try? Give me the link.
    Maybe there is really something I've missed. I can just upload patched firmware if you want.
    Actually my info is valid for TWN firmware. I haven't checked SG-MY. But I'm good at solving reboot problems.
    further info tested with SG/My?

  6. #125
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    All my info is correct for SG-MY except HWID, it's different. But it doesn't affect the solution.
    Also I've managed to run that firmware by patching the function that reads region34.HWID. The patched function always returns 0xFFFF.
    So I can't reproduce the reboot on my device.
    Last edited by kunix; 24th November 2011 at 10:27.

  7. #126
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    thanks for the clue, now I can manage to bring the US unit to Asian firmware.

  8. #127
    Navigation software expert turboccc's Avatar
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    Anybody knows in which region the POIs are stored? I would guess region 41, but I do not find them even after decryption.
    [Only registered and activated users can see links. ]

  9. #128
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    turboccc

    will you post the tutorial in picture of how you managed to install/solder the new internal mic on a 37xx unit?
    and how to disassemble the unit..
    i googled for the mic with keywords like "37xx mic, garmin replacement mic, 3790 mic ETC" with no luck, where did you buy yours?

    i was playing around with my 3750 last night, flashed it to 34xx, got the voice command function working from webupdater, and now i need to know the difficulty level of installing the mic.. im never good with soldering, hope you can help us in your convenience. thanks

  10. #129
    Navigation software expert turboccc's Avatar
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    @aiexbadboy,

    This is the microphone I used. You can buy it for 3.71$ at DigiKey.

    [Only registered and activated users can see links. ]

    1- You have to open the unit using a credit card or something thinner. I had a little plastic card half the thickness of a credit card. You have to slide it all around the GPS until it starts to open. Go slowly and take your time.

    2- The microphone is just under the antenna (a somewhat orange/rose 1 inch square with a metal plate and a solder dot in the middle. The antenna is soldered on a rectangular green PCB with a long reactangle protuberance. First, there is a screw to remove close to the antenna. Now, you have to pull the PCB, but it sticks to the LCD which is under by the mean of 2 dual face stickers. It sticks very well. Do not pull the PCB too strongly, because I marked mine by doing so. You have to heat the PCB with the antenna with a blower. Once it is hot, the sticker will be less strong and it will let go the PCB more easily. You may want to insert something like a small plastic screwdriver under the PCB to help you pull (gently) the PCB without marking the LCD just under.

    Caution: if you damage the LCD in any way, you'll have marks on it when you light it up.

    3- The microphone footprint is hidden by a small black tape sticker. Pull it gently and keep it.

    4- The microphone is 4 mm by 1.5 mm. It is VERY small. There are 2 pads on it and you need to solder 2 wires #30 (wirewrap) of 1 cm (1/4 inch).

    5- The 2 wires must also be soldered on the PCB. The + from the microphone must be soldered in the center of the microphone footprint. The other wire goes on the big circle around the center tap.

    6- There are 2 tiny resistor footprint. The one closer to the PCB edge must be either shorted with some solder or you should install a 0402 resistor on it. I made a solder bridge. Much easier.

    7- I put the black tape sticker over the 2 solder joints on the PCB trying to hide any metallic are to avoir shorts with the microphone. Because you have to put the microphone in the hole of the top cover of the GPS and put the little antenna PCB where it belongs, I folded the microphone and bended the 2 wires in the middle. This is where the black tape sticker goes into play to prevent any shorts.

    8- You are ready to close everything. It is a good idea to test the microphone before you do so.

    I'll try to take a few pictures although I would prefer not to go play there again...

    A few warnings:

    - You may mark your LCD
    - The microphone is VERY tiny and the solder pads are VERY small. You need a good soldering iron and some soldering skills.
    - The most important part: take your time. It took me one hour because I had no idea what I was doing. I am sure it would take me another 30 minutes to do it on my second GPS. This is not a 5-minute job.
    [Only registered and activated users can see links. ]

  11. #130
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    catymag's Avatar
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    Thanks ,added in Tutorials Index (Hardware list)

    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

 

 
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