1. install driver. 2.Open Flash Tool 3.Open Download Agent and select MTK_AllinOne_DA 4. Open scatter_loading and select SW---> WBWS212WA_0301_T5067 MT6577_Android_scatter_emmc 5. Click Firmware-> Upgrade and connect USB with mobile (without battery) 6. Insert Battery then start downloading .. 7.When it shows Firmware Upgrade with green colour, the installation is completed.
Download Here D1 Firmware