Now for the core process. Follow exactly to avoid soft-bricking your phone.
Without proper drivers, your PC will not detect the Winstar W30. Follow these steps: winstar w30 flash file
use "Format All + Download" unless absolutely necessary, as it can erase your device's IMEI/NVRAM network data). Initiate the Process: Click the green button at the top of the SP Flash Tool. Connect the Device: Now for the core process