X4 firmware version 1.3.2.105 introduced a change to the host interface. Onload version 9.2.0 is updated to reflect that, but also operates safely with earlier firmware. However, Onload versions older than 9.2.0 are at risk for event queue overflow if used with the newer firmware. You should upgrade to Onload version 9.2.0 or later when updating your X4 firmware.