This is mainly a bugfix release but includes some new features, in particular to better support systems with long CAN bus lengths. Release notes are at https://github.com/Duet3D/RepRapFirmware/wiki/Changelog-RRF-3.x-Beta#reprapfirmware-362-beta1.
Users of Duet with attached Single Board Computer should upgrade from the package server as usual. Users running Duet in standalone mode, use the files here. The WiFi firmware files have not changes in this release.