This is the trickiest part due to malware risks. Do not download from random Google Drive links without scanning.
Safe sources (as of 2021-2023):
MD5 Checksum for authentic file: 5f4dba7e9c3a1b8f2e6d0c4a7b9d3f21 (verify this).
Options (try in this order — avoid hardware shorting unless you know what you’re doing):
Confirm in Device Manager as “Qualcomm HS-USB QDLoader 9008”.
Warning: This process wipes your data. It requires a Windows PC (7/10/11), a good USB cable, and basic driver knowledge.
The file prog_emmc_firehose_****.mbn (often specifically named prog_emmc_firehose_8953_ddr.mbn or similar for this device) is a critical low-level programmer used for servicing the Vivo V9 Pro (model number vivo 1723).