My Acer Z160 has a weird problem with flashing and reset
That means your device's eMMC is (Write Protected), Which means that it won't accept any changes you do, This is a common problem in MTK based devices, Actually you have to replace the eMMC chip by a new one, But you can also try this,


Run SPFT and Load "Scatter" File,
Go to "Format" tab,
Don't mess with any options there,
Click "Start" then Plug your phone,
Wait until the Format process finish,
Now just try to flash the phone again with SPFT,


NOTE: After this process your phone won't have IMEI anymore, But that's not a problem since there is a lot of ways to restore it, Just check this Video.  

If the above guide didn't help fixing your phone, then as i said before, eMMC needs to be replaced.