I forgot it and remembered. I have a VIP card too.
“Service mail” e-mail address and possibly customer S/N(a bit small number…) are printed. If you send e-mail to the address printed, you may contact CHUWI service though I have not used it.
and, I found the original warranty card which covers 1 year warranty.
(But, honestly I don’t want to send Hi10X back to CHUWI. Windows tablet with keyboard + touchpad + stylus pen under $300 is unbelievably low-priced, has ability to take place of iPad if CHUWI improves S/W, H/W, and its support.)