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  1. #111
    Navigation software expert turboccc's Avatar
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    I flashed my 3750 to 3450. Then, I flashed region 41 froma real 3490 and it became a 3490. Then I flashed to 3790 US. It worked but the GPS was still a 3490 (which was expected). I tried to flash CHN fw but got rebooting loop. I flashed by original region 41 from a 3750 to try to get back to original.

    This was not enough. I dumped all regions and noticed region 34 was altered with a 1101 HWID that appeared in region 34. I flashed both original region 34 & 41 and now I am back to normal as a 3750 that can be flashed to CHN and other foreign firmware.

    Conclusion: beware of a few more bytes in region 34. That could be the issue you had to switch to SgMy.

    Normal dump for region 34 for 3750:

    Offset 0 1 2 3 4 5 6 7 8 9 A B C D E F

    00000000 XX XX XX XX FF FF FF FF FF FF FF FF 00 00 00 00 XXXX’’’’’’’’....
    00000010 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ’’’’’’’’’’’’’’’’
    00000020 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF ’’’’’’’’’’’’’’’’

    where XXXXXXXX is my gps ID. Extra bytes appear at offset 0x10-0x17.
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  3. #112
    Navigation software expert Kanopus's Avatar
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    This seems to be still not enough for 3760 to convert to asian fimware. Maybe there is some part of Ecoroute HD support which is not copatible with asian firmware?
    Thanks, Kanopus

  4. #113
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    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.

  5. #114
    Navigation software expert Kanopus's Avatar
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    You can find in my previous post, that I have checked this combination, I mean clearing region 34 at offset 0x10, I have put there FF. I will check it again, thanks, but maybe there is something else which prevent my nuvi from running asian firmware?
    Thanks, Kanopus

  6. #115
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    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.
    Last edited by kunix; 21st November 2011 at 14:16.

  7. #116
    Navigation software expert Kanopus's Avatar
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    I was trying this one:
    Code:
    Please Login or Register to see the links
    I was using whole firmware with boot.bin but patched for hid 1101.
    Thanks, Kanopus

  8. #117
    Navigation software expert turboccc's Avatar
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    Quote Originally Posted by kunix View Post
    Also turboccc's 3750 works fine because is has region34.hwid == 0xFFFF.

    Well, region34.hwid went to 1101 at some point causing the rebooting. I had to brint it back at FFFF.

    Kanopus, maybe you hsould have used real US boot.bin. I am not sure that just patching HWID in any boot.bin is good.
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  9. #118
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    aekhong's Avatar
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    Quote Originally Posted by Kanopus View Post
    I was trying this one:
    Code:
    Please Login or Register to see the links
    I was using whole firmware with boot.bin but patched for hid 1101.
    I tried for many time and got reboot.
    Can you change hwid from 1101-->1288 by flashing with original SgMy firmware?
    GPS Lover.
    974c07a6a129e2e0917a011314c2c0bd

  10. #119
    Navigation software expert Kanopus's Avatar
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    Ok, tested with firmware TW 2.50, failure again. What I have done:
    - cleared NV using developer menu,
    - set language American English
    - erased regions 132, 139, 140
    - put FF in region 34, offset 10-17
    - dumped changed regions and checked their content
    - flashed unmodified firmware in rgn.

    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.
    Thanks, Kanopus

  11. #120
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    why not try to check the changed region only after flash the MY/SG 230 then again after MG/SG 300?

 

 
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