Unless it is pre-rooted (install Root Checker to be sure) it is unlikely the developer support will exist for a budget brand tablet, and even if it is pre-rooted, forget custom ROMs because the likelihood of a custom recovery image supporting these cheapies is pretty low.
Rooting a budget tablet is pretty much good only for overclocking and system management. (Linux guru type stuff like changing VM heap size, memory management, etc)
FATAL system error #nnnn
CAUSE: We should never get here!