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It sounds like there might be an issue with the Bluetooth module on the BTH-1208LS board. A factory reset on the RN42 Bluetooth module may help, but it's important to note that this could potentially erase any custom settings or configurations that have been applied to the module. Before proceeding with a factory reset, you could try the following steps: Ensure that the batteries are fully charged and inserted correctly. Verify that the button is functioning correctly and is not stuck or damaged. Attempt to pair the device with a different Bluetooth host device to see if the issue is isolated to a specific host. Try resetting the board by disconnecting the power source, waiting for a few minutes, and then reconnecting it. If none of these steps work, then a factory reset on the RN42 Bluetooth module may be necessary. To do this, you will need to enter command mode by sending the command "$$$" over the serial interface. Once in command mode, enter the command "factory R,1" to perform a factory reset. After the reset, you will need to reconfigure the module with the appropriate settings for your application. You can refer to the RN42 Bluetooth module datasheet for more information on configuring the module. best regards reavida marcos https://www.multispanindia.com