It seems impossible to me to unlock the route with Blake, I played a good amount changing several choices and I can't go ahead with his route
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I think what he meant is that he can no longer even choose to go on a date with Blake. From the last update, the menu after the save warning was removed and now it is more linear. The update took you through Oliver's and Adam's dates, but then ends after you tidy up Hailey's room. There is no Blake or Dante date anymore, or at least that's how it seemed.