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  #71  
Old 02-19-2006, 12:09 PM
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Okay boys I'm one step closer I haven't tried it yet. Seems as though somethings have transpired overnight and I had to do some research. Anywho, thanks to "ambishop" for pointing me to jacksum. I have indeed verifed the checksum on my hacked version of "navboot" and the original V26 file. They are indeed identical. Now the testing begins.

Off to my car. I'll report back as soon as I can. Pray for me folks

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  #72  
Old 02-19-2006, 12:11 PM
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We're praying beedeeman!!!! You reverse engineers rock! This is better than watching 24!
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  #73  
Old 02-19-2006, 12:12 PM
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Quote:
Originally Posted by beedeeman
Off to my car. I'll report back as soon as I can. Pray for me folks
  #74  
Old 02-19-2006, 12:44 PM
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Quote:
Originally Posted by 2Wires
I also thought about that. But unless I know how they create the checksum, I cannot reproduce it.
The most simple would be XOR but there is also CRC etc.

I guess without further inside info we are screwed or can just try.
My program replaces the images very exactly. So if someone can exchange the image with a smaller one (filesize) and it works, then we know that there is no checksum.
With bigger file is always the risk to "disturb" the bytes of the next file.
2Wires, if the method of "checksum" is discovered, could you introduce the code in your GifExtractor (http://http://carmes.de/download/sof...Extractor.exe) to correct it and make the process of change logos more easy?
  #75  
Old 02-19-2006, 12:52 PM
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Sorry for entering the party so late !!!

Since it seems I was the one that originally started this craze, it's only fair that I answer.

Here are a few notes, speaking from personal trials (yes, I was brave enough to try on my OWN nav computer)

1) No, you cannot "permanently" screw up your nav computer with a corrupt image. If you screw up the checksum with an invalid GIF89a image, the disc will either NOT boot, or will boot and hang during the middle of the install

2) Dont panic, turn the car off. If you have a video module, when you turn the car back on, you'll have a very rudimentary main menu. Eject the disc from the nav computer, and insert a FRESH copy of v26. Give it a few MINUTES (not seconds). It will eventually boot and load the fresh copy of v26 back onto the computer. Then you're free to go back into the house and continue hacking the OS LOL

DISCLAIMER: Just because I've flashed mine about a ZILLION times and not killed it, doesn't mean you'll do the same LOL

Now, for the other news.

I have NOT changed the logo, but I have been able to successfully REMOVE it from the code.

There is indeed a checksum, however, we need a Microware OS-9000 guru to figure out that portion.

I have a copy of IDA PRO if anyone needs it (with the OS-9000 plugin)
  #76  
Old 02-19-2006, 12:55 PM
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Only difference in tioarch.tar is in nav_gd.tio. In T26.09A: AdviceMode=3 and in V26 AdviceMode=0. Someone please make a copy of V26 with tioarch.tar from T26.09A and see what happens. Maybe it's this easy...
  #77  
Old 02-19-2006, 12:58 PM
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Update: Sorry guys, need to go back to the drawing board. I thought I cracked this nut. I'll provide an update when it's fully functional. I think I'm off by two bits.
  #78  
Old 02-19-2006, 01:07 PM
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@JBerto & All
As soon as there is a routine found to exchange the images and keep the checksum, I will implement it into the GifExtractor.

@beedeeman
What went wrong? Was the checksum incorrect or didn't the navi take the update though the checksum was right?

Tino
  #79  
Old 02-19-2006, 01:11 PM
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Some systems use multiple checksums, one on each block of code/data, and then another at the end of the data.
  #80  
Old 02-19-2006, 01:13 PM
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I have one image that works GREAT, but trying another method based on comments that the V26 files are newer
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