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I have changed the Google pw via my computer and know need to chang it on my Z2.
How do I do that?
BR /Lars
Try syncing your Google account - you should get some form of warning notication which should prompt you to re-enter your new password.
if the above doesnt work.. usually launching the play store would prompt such message. Incase neither of them works for you try the following:
settings > accounts tab (scroll to the bottom) > google > click on your gmail.com > top right menu > remove account > then just readd your google account from the accounts tab in settings.