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Download the latest firmware for IQ15B or IQ18B using the below links:

IQ15B

IQ18B


While holding the SETUP button on the back of the sub, power on the sub.
Keep the SETUP button held down until the sub has powered on completely.


Connect the sub to your Window PC using a USB cable.

Run the “TURBOSOUND UsbUpdate_V### .exe” file that you downloaded above.