Can I use the Bluetooth function of my smart speaker when it is not connected to a network?
You can't use the Bluetooth function without an established Wi-Fi connection.
Connect it to an active network during initial setup, then pair and connect it to a Bluetooth device.
For LF-S50G:
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If network connection shuts off after initial setup, connection and playback via Bluetooth are possible. However, the speaker will power off one hour later.