The designation "R1" stands for "Release 1," indicating the first major update of the year 2015. In the software lifecycle, R1 releases are often the most stable because they are built upon the previous year's architecture (2014.R3) with refinements rather than experimental overhauls. This stability is a primary reason for the software's longevity.
From European giants like Volkswagen, BMW, Mercedes, and Fiat, to Asian staples like Toyota, Honda, and Hyundai, the software provided deep access to not just the engine control unit (ECU), but also: Autocom 2015.R1 Delphi 2015.R1 -Cars