Here you can download Spreadtrum SC7731 based PAC Stock Firmware for the itel it1550 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 SC7731.
[*] Driver: SPD SCI Android USB Driver.
[*] Flash Tool: SPD Upgrade Tool.
Firmware for itel it1550
Build Number: IT1550-Z106-20151117
Android Version: v5.1 (Lollipop)
Download Size: 663 MB
itel it1550 Flash Tool & USB Driver
Flash Tool for itel it1550
itel it1550 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 itel it1550 phone powered by Spreadtrum SC7731C CPU. So you need to use SPD Flash Tools 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.