I’m not sure if anyone got a manual with their device but Caspy7 located this basic manual for the Android version. Click the link in the last row of the table - the direct link gives an error.
Unfortunately there is no information on how to force a reset or get into recovery mode which we really need right now.
If anyone can speak chinese we should contact the head office and ask. I’ve pinged a mate who is in China to ask for his help.