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Originally Posted by KiwiJochen
I've seen this problem before, caused by corrupt OS disc, because of scratches / poor burn. Nav cannot boot properly.
Burn yourself a new OS disc, and CHECK IT THOROUGHLY.
Burn at the speed supported by the disc.
Do a surface scan. Measure the C1 and C2 errors.
Only when good, should you try it.
You may need to use an old OS version to be different to what is in the car.
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thnks Jochen...
Instead, I've never seen this before on an mk4...on mk3 several times but not on mk4...
Once on my own car I tried to install a V30 and happened the same thing...brief flash white and black and nothing more, but I tried again with the same cd and this time the upgrade went right...
So, you think I should try with a V17 and a keycd?
Than, if all goes right, upgrade with V31?
And should be helpful disconnect the power for a while?