Sena Bluetooth SMH5-FM v1.3 User's Guide - Manual (Page 28)

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SMH5-FM
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11.13 Fault Reset
When the SMH5-FM is not working properly or is in faulty status for
any reason, you may reset by pushing the pin-hole reset button at
the back of the headset main unit. Insert a paper clip into the reset
pin-hole and press the reset button for a second with light pressure.
The SMH5-FM will be switched off after which time, you have to turn
the system back on and try again. However, this will not restore the
headset to factory default settings.
12. FIRMWARE UPGRADE
The SMH5-FM supports firmware upgrade function. Please visit
Sena Bluetooth web site at www.SenaBluetooth.com to check the
latest software downloads.