njsges Posted October 25, 2008 Share Posted October 25, 2008 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 Link to comment Share on other sites More sharing options...
SW03ES Posted October 25, 2008 Share Posted October 25, 2008 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. Link to comment Share on other sites More sharing options...
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