I had posted before on the availability of a Firmware upgrade for Nissin Di622 here. The latest update as below when I wrote to them again. So looks like we have to wait for a little longer 
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Dear Chris
The firmware is ready for Nikon model only. But we are having problem with our update kit. Nissin HK has advised us the steps.
I shall keep you informed once the upgrade is availabe at our office.
Thank you and regards
Fionne
Schmidt Marketing (Malaysia) Sdn Bhd
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