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  #1  
Old 01-12-2014, 11:47 AM
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Cannot upgrade or downgrad BMW MKiV unit

This is the first unit facing this problem.
I put in a downgrade CD, screen is telling that the software will be loaded, turns black and stays black. Not even the grey/blue update screen with the progress bar. After a few minutes the disk is ejected. Still all what I see is a black screen. I push OK to get the unit restarted, see some flickering and that's it.
After disconnecting the power and wait for > 1 min, I get the video screen (light blue, white letters) and no navigation option anymore. If I the take my CD with the modded firmware, it is being read, ejected. But that's it.
If I use the original CD which I have used with the firmware what was installed on this unit, it is being read. But after eject I have to disconnect the unit. Wat 1 minute and then it's all back. But of course with the original firmware and splash screen.

The CD's I am using do the work on all other units, except this unit. Can it be a worn laser what is causing all of this or is it in the unit itself ? Because I have no explanation why the update screen with the progress bar is not shown.

Thanks,
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  #2  
Old 01-12-2014, 12:23 PM
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throw the nav unit into a refrigerator, reconnect and see if it will read the CD... i suspect a "cold" soldering joint but i could be totally wrong... when the TV module generates the menu, it means that the nav has fallen off the ibus and the tv module takes over... falling off the ibus can be directly firmware related (could be due to some hardware made different manufacturer not fully compatible - is this unit same as the other ones you are working with?), or could be something simple and stupid as a loose joint...

oh... and about the refrigerator - i was just kidding... don't cause condensation damage to the unit!! lol...
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Old 01-12-2014, 01:42 PM
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I have not checked the hardware versions yet. This is a 2002 unit. The other ones where all newer. From 2004 I think. But when I have bought this unit it had an old firmware version. My default disk did the update without any issue. But now I am not getting the progress bar anymore and it refuse to actually update. Perhaps something with the flash memory ?
But I like to know if it can be also laser related. Nevertheless, the DVD with the road maps is read without any issue.
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Old 01-12-2014, 01:45 PM
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one time i needed to upgrade an MK4 to read cyrillics - one unit was fine reading the maps and all, but bulked at reading the cyrillics properly... nothing could be done... finally, we switched the unit, and it took the custom firmware without a hiccup - i think the new piece was a different manufacturer of the same MK4...
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  #5  
Old 01-12-2014, 02:03 PM
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Thanks.

Will check the unit. Is a plausible explanation.
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