Factory reset Windows tablet without keyboard and password

[Windows 10]

I received a Windows 10 tablet as a gift. The tablet is Prestigio multipad visconte V, I don't know the password as the tablet was second hand. When I try to reset it using Widows restore, it says there is not enough space. I tried using a USB drive to reset it that way but the USB drive is not recognized, same is with the keyboard.Also I tried to enter commad prompt but is asks for password.To enter boot menager you can hold power on and volume up button, but when I do that it brings shows me:entering dnx mode waiting for fastboot command...Tablet is not showing when i connect it to the PC.UE

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