Since a global firmware doesn't exist, users typically optimize the existing Chinese ROM for international use instead:
Download the Vivo_Y75A_Global_Top_PD2049F_EX_A_12.0.20.zip . Extract it to a folder on your desktop. You should see files like: preloader.bin , scatter.txt , boot.img , system.img , vbmeta.img . vivo y75a global firmware top