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The setting change ought to be easily enough reversed. (I understand French substantially, so if you read choices on the screen to me, I can interpret.)
But do you know the Garmin model?
The Language icon, if the Settings screen on it has icons, should be a pair of lips, and should read
or something like that, in French. English, the choice you want to change to, is of course
The Settings, then the Language, is the order in most models.
In other models, the sequence is Tools, then Settings, then Language.
Let me know if you need further guidance for this problem.
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