This typically means the Firehose file is mismatched, or the connection timed out. Disconnect the phone, pull the battery, re-enter EDL mode, change your USB port (preferably to a USB 2.0 port), and try again.
Click next to the Programmer path and select the downloaded vivo_v9_pro_prog_emmc_firehose_2021.mbn file.
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Use official tools like QPST (Qualcomm Product Support Tool) / QFIL or trusted third-party service utilities like Miracle Box, MRT Key, or UnlockTool .
Check your PC's . Under Ports, you should see Qualcomm HS-USB QDLoader 9008 . You can now release the tweezers. Method 2: Fastboot Command (For Soft-Bricked Devices) If your phone can still access the fastboot screen: Connect the phone to your PC via USB. Open a command prompt in your adb/fastboot folder. Type the command: fastboot oem edl or fastboot reboot edl . How to Flash Using the Progemmcfirehose File This typically means the Firehose file is mismatched,
What are you seeing in your flashing tool?
As the Vivo V9 Pro aged, older firehose files became incompatible with newer firmware security patches rolled out over the years. The "2021" designation often refers to a specifically signed, updated, or modified firehose loader necessary to bypass these updated security measures in later Funtouch OS versions (such as those approaching or surpassing Android 9 Pie). This public link is valid for 7 days
Vivo regularly updates its security patches. The 2021 version of the firehose file contains the specific digital signatures required to unlock Vivo V9 Pro devices running newer, updated stock firmware versions that older files cannot penetrate. Common Use Cases for the Vivo V9 Pro Firehose File
Official updates for the V9 Pro, such as version 6.70.10 released in May 2021, are available directly via Vivo Support .
I can provide specific troubleshooting steps or configuration settings for your exact tool. Share public link