I'm not saying this will serve specifically for your team, because in Chinese things, they are things that Chinese work in some of these combinations
Vol up + power button
Vol - and power button
Home Button + Power Button
Vol +, Vol - and power button
In that way, you can enter without any problem to Recovery Mode. Once inside this menu, simply select the WIPE DATA / FACTORY RESET option and accept the Home button, Menu or Switch, wait for your tablet to react and not turn it off until you report that the process has finished