2.q1 is a good name. I do not think NEC will release any slave firmware soon. Thanks!
BTW I tried to flash 6750 with 2.p1_rpc1 with Binflash 1.27 gui and got a "supplied file does not contain a valid firmware" error. Then I tried 2.p1_fast and got the same result. I downloaded again and again, still the same. What did I do wrong? Thanks!