Device OS 5.9.0 is now available with new features, bug fixes, and improvements. Muon support including auxiliary power control is introduced in this release, and it allows for an updated tinker application to automatically configure your board when going through setup.particle.io. A number of Wi-Fi and BLE stability fixes are included for the Gen4 line (P2, Photon2, and M-SoM), and it is recommended that all Gen4 devices move to 5.9.0.

Release notes can be found here on Github.