: If the phone is "dead" (won't turn on or enters a boot loop), the Firehose file enables a full factory firmware re-flash.
If you encounter an "Authentication Required" error, you may need a patched loader or a tool that supports the updated Vivo DA (Download Agent). vivo v9 pro progemmcfirehose 2021
Depending on why you are searching for the firehose file, try these alternative paths: : If the phone is "dead" (won't turn
Warning: Working with low-level tools (EDL/Firehose) can permanently brick your device, erase data, and may void warranty. Proceed only if you accept these risks. This guide assumes the device uses a Qualcomm chipset supporting EDL/Firehose and that you understand basic flashing/ADB/fastboot concepts. vivo v9 pro progemmcfirehose 2021