Q2/Q2M + SF C1 + SF60 flash synchronisation speed

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I have found that flash synchronisation speed of my Q2M (firmware 5) with the SF60 mounted is 1/2000.  However, when I trigger the flash via the SF C1 at 1/2000 the picture is completely black.  At 1/1000 it synchronises ok.  Firmware for the SF C1 is version 001.  I am wondering if upgrading it will fix the discrepancy.  The SF C1 manual advises to contact a Nissin dealer for the firmware.  I have not been able to find it on the Nissin website.  There is firmware for the Nissin controller for other camera brands on the Nissin website, but not for Leica.

Alternatively, is there a hot-shoe cable for leica flashes?

Thanks