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  #61  
Old 02-19-2006, 10:10 AM
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It worked in my upgrade. Good Job. Cute logo.

So process is as follows, swap logo, adjust last 3 bytes of file with new 24 bit checksum. That means we can change anything we would like in that file



magic iso replace the navboot file
Alcohol 120 modify the lead out to match the image

now lets figure out the bit to flip to turn on OFF ROAD GUIDENCE!

http://www.bimmerboard.com/forums/posts/139364/



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  #62  
Old 02-19-2006, 10:12 AM
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Hi,

i have changed the sw_rel.tbl file on the T26.09a cd to the original V26 sw_rel.tbl file. All other file is original from T26.09a, and not modified. Result: after loadig original BMW logo and 4-1-60 Software Version in Set menü ! But no Birdview option.

Janos
  #63  
Old 02-19-2006, 10:16 AM
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what do you use to calculate the 24 bit checksum??

so you would change the last three bytes with this #? is that in hex then???

thanks a lot guys!
  #64  
Old 02-19-2006, 10:20 AM
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Quote:
Originally Posted by ambishop
It worked in my upgrade. Good Job. Cute logo.

So process is as follows, swap logo, adjust last 3 bytes of file with new 24 bit checksum. That means we can change anything we would like in that file
Cool.

What software are you using to work out the 24bit CRC checksum?

Rgds
  #65  
Old 02-19-2006, 10:47 AM
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Here is a free one http://www.jonelo.de/java/jacksum/
  #66  
Old 02-19-2006, 11:08 AM
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Quote:
Originally Posted by Andrej_E39_535ia
has anyone noticed that date of the main nav file in 26.09a is older than in official v26 release ?

26.09 is 05.2005
the real 26 is 07.2005

i think that cd 26.09a created prior to official release of v26

and i think that 3d view was canceled prior v26 release
and v27 will not have 3d too

in v26 there is code for 3d view
first off all, it is possible to find phrase "perspective" in navboot file on cd
and, as we all know, 3d view "temporarely" works if we downgrade to official v26

there is tar archive file on cd "tioarch.tar" which holds some *.tio files with variables for navi soft

maybe it is possible to alter some variables or add one which enables 3d

maybe it would be possible to enable 3d view in real v26 or maybe in upcoming v27 if bmw really decided to cancel it

-
Best regards from Lithuania
I think this is a smarter approach. Using V26 software we should just enable the features we are looking for

Martin
  #67  
Old 02-19-2006, 11:25 AM
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Quote:
Originally Posted by ambishop
can u comment how this program calculates checksum?

it takes file ? excludes last 3 bytes ? calculates crc 24 and writes checksum to the end of file in place of excluded ones?

or it calculates checksum on all file?

thanks
  #68  
Old 02-19-2006, 11:28 AM
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I like this stuff. Reverse engineering at its best.
  #69  
Old 02-19-2006, 11:29 AM
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Quote:
Originally Posted by ambishop

I've got the jacksum working, but the problem I have is if I take the navboot file, remove the the last 3 bytes, then pass it through the jacksum app. I get a different checksum to what is in the file.

So the question is: what part of the navboot file do you chop from the file before passing it through jacksum?

I hope you understand....cos I only just do!
  #70  
Old 02-19-2006, 11:57 AM
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can someone post a clone cd or iso image of the 26.09a update with the plain jane mkiv ===bmw=== logo? you'd be my hero. i know just enough hex to screw up my nav drive, i'm sure.

thanks
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