Install application - Computer unauthorised
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"Unauthorised" indicates that the toast appearing on the screen of the device has not been validated.
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To have the toast again, disconnect the device of the computer from the device side and plug it again.
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A
adb kill-server
before plugging again might help.
Don't forget to check the smaller box on the toast to authorise definitely the computer.
I'm still not able to add an application: