If your SPRINT cannot be searched by XOSS APP, you can perform some basic troubleshooting steps:
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Make sure that your phone's Bluetooth is turned on and that the XOSS APP has obtained the relevant Bluetooth permissions.
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Make sure the SPRINT is turned on and in sync mode.
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Make sure that SPRINT has been unbound from the Bluetooth of the mobile phone system.
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Try toggling Bluetooth off and back on again in your phone's settings.