Onda announces it on Weibo a day after everyone else reported it:
There are four hardware versions of the Onda V989. Check the back of the tablet to see “V1,” “V2,” etc., to get the version number. Only use the firmware that applies to the specific hardware version number.
By the way, I don’t note all firmware releases for all tablets. I figure that’s up to the owners to keep track of — especially when OTA updates are available.