help merapi write problem

Flash files count is :9
Action : Firmware update.
Selected Acer: Liquid Z110
Phone must be off with battery inside.
Please insert USB cable now…
Detected : MTK USB Port (COM6)
Phone detected…Please wait
Sending DA agent, please wait…
All done.
i m write the same mobile factory backup mt 6572 (readed working phone)
then merapi after 1 min all done
no write any file
infecteded mobile on condition orignal backup working all 5 time set dead after orignal backup write on set set fault wifi auto on download apps auto (virus)
merapi ver 1.4.4 use