R means release 14 is the major release number B is the minor release 'number'. By convention, 'A' is not considered ready for production, whereas 'B' and lat

R means release 14 is the major release number B is the minor release 'number'. By convention, 'A' is not considered ready for production, whereas 'B' and later are. 02 is the 'patch level', i.e. an even more minor release number This scheme, or at least the part up to the 'B', was used all over the place in Ericsson while I was there (a decade ago). I just pulled the battery off my phone to see if it was still used and it doesn't seem to be. One of my previous mobile phones had R1F on the sticker behind the battery...