Hi. Measures you could adopt are:
Charge it if flat > open the back cover > break and reconnect one battery cable > try to boot into recovery mode and wipe userdata and the reboot and observe. If that fails: then you will need to try and and have the ROM or firmware here http://roms.satechhelp.co.za/product/mobicel-echo-10-tablet-firmwarerom/ reloaded.
Charge it if flat > open the back cover > break and reconnect one battery cable > try to boot into recovery mode and wipe userdata and the reboot and observe. If that fails: then you will need to try and and have the ROM or firmware here http://roms.satechhelp.co.za/product/mobicel-echo-10-tablet-firmwarerom/ reloaded.