Need Help, i was Brick my tablet

First, sorry for my bad english.

hello friend, i have tablet called ADVAN VANDROID T1S MTK6589. i was flash wrong firmware version, and now my tablet is completely dead. no logo, no vibrate.
i trying to flash again for correct firmware, spflashtoll wont recognized it.
computer detect my tablet as "Mediatek USB port" not "USB VCOM ........."
how to change mediatek usb port to usb vcom port? i think this is the problem.

what i try is.
install official driver -- not work
try find meta mode driver -- not work
i draining out my batrei then try to connect to pc again -- still detect as mediatek usb port, not vcom

please give me advice, how i can revive my tablet.

thanks