So, you have a tablet with an Allwinner processor eh?
at present there are two tools for flashing your tablet with a new ROM
Livesuit
and
PhoenixCard
(even though the Livesuit tutorial specifically names the Visual Land tablets, it can be used for anything running an allwinner processor)
Livesuit requires proper drivers, and a computer connection, while PhoenixCard only requires you to burn an image through the PhoenixCard utility to a microSD card and then you just put that card into your tablet, and away you go. Of course, in either event you will require a ROM for your tablet.
Good Luck