Process:
- Open UMT Dongle (QCFire)
- Go to the “Vivo Special” Tab
- Click on Loader Button and Select prog_firehose_ddr_fwupdate.elf File
- Select Erase Userdata from the option Format Type
- Click on Execute
- Press and hold the Volume Up + Down Button and Insert USB Cable to the Phone
- Wait Until Completed
