On 27 June 2017, Rita Ora debuted a semi-acoustic version of "Lonely Together" at a private event at Annabel's in London. He shared one-minute snippets on Instagram, captioned "New music coming very very (very) soon!", with track titles as hashtags, followed by teasers of each track from the EP upon release. He said of the release: "I'm really excited to be back with music once again. It has been a long time since I released anything and a long time since I was this excited over new music! My focus on this first EP of the album was to get a mix of new and old songs: some that fans have been asking about and waiting for mixed with brand new songs that they have never been heard before!" In an interview with Pete Tong on BBC Radio 1, Avicii stated: "It's the first EP of 3, so the whole album will be released with the third EP."
Ryan Castillo of Dancing Astronaut labelled the EP as a "refreshed and reenergized take on his [Avicii] happy, upbeat progressive style". Brian Bonavoglia from DJ Times wrote that Avīci (01) featured Avicii returning to his roots with tracks that contain his "signature production style built around infectious melodies" which "create the uplifting energy that helped propel him into stardom".Renowned For Sound's Haydon Benfield felt that although the tracks were "tightly focused and highly polished" in their production, they lacked elements which were worthy of praise. The critic concluded by describing Avicii's style as "interminable, incessant, and uninterrupted", and gave the EP a 3/5 rating.