Here you can download Spreadtrum SC7731E based PAC Stock Firmware for the Symphony i15 Android device. The downloadable file High Compressed in an archive, You will get the Flash File after extraction. Included contains Flash Tool, USB Driver, and how-to Flash manual instructions.
[*] Chipset: Spreadtrum SC7731E.
[*] Driver: SPD (SCI / NPI) Driver.
[*] Flash Tool: SPD Upgrade Tool.
Get Firmware for Symphony i15 (Flash File)
Build Number: i15_HW1_V11
Android Version: v8.1.0 (Oreo)
Download Size: 707 MB
Symphony i15 Flash Tool & USB Driver
Flash Tool for Symphony i15
Symphony i15 USB Driver
[*] Backup: During the flashing process SPD Flash Tool will erase user data from the phone. So you need to backup for restoring those files on your device.
[*] Device Information: The Symphony i15 phone powered by Spreadtrum SC7715 CPU. So you need to use SPD Flash Tool and SPD USB Driver to flash Firmware on this device.
[*] Flashing Information: You can try different types of SPD Flash Tools to flash this Pac file if you see any of them show interrupted in flashing. The following Tools are Upgrade Download, Research Download, and Factory Download.