If you have a second, functional Winstar W30, you can use MTK Droid Tools or Readback in SP Flash Tool to create your own flash file backup.
Pro Tip: When downloading, look for the exact model number (check under the battery or in Settings → About Phone). Common variants include W30_MT6580_V1.0 or W30_MT6737_V2.1. winstar w30 flash file
Now for the core process. Follow exactly to avoid soft-bricking your phone. If you have a second, functional Winstar W30,
To install the Winstar W30 flash file, you will need the following: Under Options → USB Checksum , disable it
There are two primary methods depending on the state of your receiver.
Yes – any unauthorized software modification voids the warranty. However, if your phone is already bricked, you have nothing to lose.