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Posted

I have my friends 2007 ES350 Navigation disc. If I make a backup, can I downgrade my 2008 from 7.1 to 5.1, and will it work? Any help would be greatly appreciated.

NJ

Posted

As I said in your other thread and in all the other threads in which you have asked this question. NO. The system cannot be downgraded once it has been upgraded.

Please do not post the same question all over the site, once in one forum is enough.

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