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Originally Posted by likev
As per an earlier post, I updated both my US based cars w/ v28 and all functions are working fine and still in US mode. Maybe some folks are trying to do the update twice with the same version or doing it a second time w/ an older version? Doing it a second time with either the same version or and older version will throw your nav into Euro mode.
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Small clarification .... If you attempt to update the NAV firmware with the same version you currently have installed, the NAV system will not perform the update as there is nothing to do. It checks the version number with whats installed and whats on the CD. It also does not switch to Euro mode on doing this!
There is one exception to this rule that we know about. It involves replacing the voice prompt(s) with a different language. i.e switch the USA voice to a English voice, etc. You can do this with the same version you have already installed. However, even when you do this ... it will not reset the system and take it out of USA mode.
You are correct however if you downgrade the firmware version. In all cases this does revert the Nav computer to the default region which appears to be the so called Euro mode.