Unlock with no PIN

[MikJF1947]

I have set up my brand new Teclast P80h tablet (using my OnePlus 7) as per the tablet's instructions. The setup finished successfully.
However, I now find the tablet demands a PIN to unlock. I cannot remember having used any PIN, and if I did there is only one possible number which the tablet doesn't accept.
How can I unlock without a PIN?
P.S. The reset hole doesn't reset but only restarts.

 

[ocnbrze]

I have set up my brand new Teclast P80h tablet (using my OnePlus 7) as per the tablet's instructions. The setup finished successfully.
However, I now find the tablet demands a PIN to unlock. I cannot remember having used any PIN, and if I did there is only one possible number which the tablet doesn't accept.
How can I unlock without a PIN?
P.S. The reset hole doesn't reset but only restarts.

you will have to hard rest the tablet:
https://www.hardreset.info/devices/teclast/teclast-p80/