Thanks to Vladimir Burnin, who noticed it on Weibo and left a Comment alerting me.
This is very odd. Although this Weibo appears in Teclast’s home timeline, the aggregate timeline I have of all tablet makers doesn’t have it. Perhaps Teclast deleted it but the Weibo cache change hasn’t propagated yet?
Anyway, the Weibo (which might not work):
As usual, the link goes to a locked forum post [use Chrome browser for translation].
Android 5.0 firmware version ID: C5J6, other ID to be tested
Do not attempt to use this if the tablet doesn’t have “C5J6” on its back. It will likely brick the tablet.
This is a test of the upgrade that will be fine-tuned for all models and roll out completely later.
Also, since no other China tablet makers have yet announced the availability of Android 5.0, I consider it a marketing move by Teclast to try to prop up their sales over the competition. This test version could be buggy as all hell. I wouldn’t be surprised if there are no Google apps or Play Store and contortions are required to get them on the tablet.