open Flash_tool.exe. and select File > Open Scatter-loading file ... and select the file MT6577_Android_scatter_emmc.txt from the firmware folder

Check the box DA DL All With Check Sum and Press the Firmware -> Upgrade button

If this <-- happens check the firmware and delete checksum.ini from the firmware and try again

Plug in your tablet turned off

First wait if you get a green circle after flashing you have a successfully flashed tablet.