Device OS 3.0.0 is the first formal release on the 3.x feature development branch.

• Increased maximum data size for publishes, variables, functions
• BLE legacy pairing (passkey) support and other BLE enhancements
• Improved cold and warm boot behavior on B5 SoMs and Trackers
• System power management improvements
• OTAv3 on Gen 3 platforms allows for updates to continue across sleep-wake cycles

Full Release Notes are available here. The 2.x LTS branch is still active but will receive bug fixes only.