this firmware is
VIVO Y93 & Y91 PD1818CF&DF EX A 1.8.1 PD1818CF EX A 1.8.1 VIVO MTK ALPS-RELEASE-O1.MP6-PRE4
MT6762
file size : 3.94Gb
free download link
flash with SP flashtool
this firmware is dead fix and unlocked user data.

download Download Firmware (3.95GB)