You can download the update tool Here
Follow the instructions below to use it. Please do not redistribute this link or the tool itself.
1) Connect your Siberia 150
2) Extract the Release folder from the .zip
3) Run Siberia150FwUpdate.exe
4) Press the Update button
4a) If the firmware update fails or it's unable to open the device, reconnect your Siberia 150 and then close and re-run the application.
You MUST reconnect the headset or it will fail until you do. At most this should only take a few attempts before the update is successful.