Use the QPST / QFIL Tool for Qualcomm-based Vivo devices. Drivers: Ensure Vivo USB Drivers are installed on your PC.
Do not flash this firmware on a device unless you have verified the exact model number from the “About Phone” section or the motherboard silkscreen. A wrong firmware flash will almost certainly brick your device. Pd1731-a-1.8.7 Flash File
In the tool, browse to the extracted folder and select the prog_emmc_firehose_8917.mbn and the XML files ( rawprogram0.xml and patch0.xml ). Use the QPST / QFIL Tool for Qualcomm-based Vivo devices
A green checkmark or "Pass" message will appear once the process is finished. Important Warning A wrong firmware flash will almost certainly brick
Verdict Pd1731-a-1.8.7 is a focused, quality maintenance release: conservative but effective. It doesn’t chase flashy features, but for devices in the Pd1731 family it delivers meaningful reliability gains and cleaner partitioning that make it a solid upgrade for anyone dealing with the specific hardware glitches it addresses.