I think what she exactly means in the overal context of Chuwi, is first see:
I have updated the table about the Hipen basic comparsion.
Hipen H3 support future Chuwi Hi12 tablet (after serial number XXX201704XXX)
-- Post #3 - H3 compatibility with Hi12
And contact Chuwi's official AliExpress shop, to ask if they can make sure to send you the correct one, by pasting the code into your message and clearly requesting Hi12 with H3 support.
Edit: https://m.aliexpress.com/store/2179113 /Edit.
You can best wait for their response there if you want to be sure, instead of ordering there and stating your criterium as a comment.
Chuwi's teams are not that integrated. It's not yet all streamlined. The overal systems used are not integrated for their maximum collaboration and passing on to the most logical department/colleague to handle the issue.
Edits: code correction.