The Marshmallow update for the OnePlus One is not only in the works, but is in its final testing stage. OnePlus co-founder took it to Twitter to share the good news.Android 6.0 was promised to One users back in November last year, with a planned release date in Q1 2016, which obviously didn't happen. At this point it's still not entirely clear when the update will actually make it to the masses,
