Download Vision Touch V4D stock ROM from here, flash it in your device, and enjoy the native Android experience again. The download file contains the USB driver, flash tool, and the scatter file.
Download Vision Touch V4D Stock ROM
Stock ROM File Name: Vision_Touch_V4D_MT6572_V05_20150929_4.4.2.zip
Stock ROM File Size: 401 MB
Android OS Version: 4.4.2