If you can't run xterm, nor do gainroot, the tablet has worse problems.

But if/when you can, there are three values you can set the mode to by a command string in the xterm:

echo XXX > /sys/devices/platform/musb_hdrc/mode

XXX can be:

host - host mode
otg - otg / autosense mode
peripheral - peripheral gadget mode

That will do it.