DFU Mode and Disconnect option, available in the top right menu in Global Settings
, allows to reboot beacon in DFU (Direct Firmware Upgrade) mode, for OTA (Over-The-Air) firmware
upgrade. At present, free app nRF Toolbox from Nordic Semiconductors is required for firmware upgrade operation, available for Android
Beacon will remain in DFU mode for 30 seconds, then will start working as configured.
Alternatively, you can use BlueBeacon Manager app for iOS, that includes the entire procedure for firmware upgrade.