On this web page, one can find the official hyperlink to Download Samsung SM -G850Y Stock Firmware ROM (flash file) in your Computer. Firmware is available in a zipper bundle, which comprises Flash File, Flash Tool, USB Driver, and How-to Flash Manual.
Samsung SM – G850Y Stock Firmware (flash file)
The Flash File will assist you to Upgrade, Downgrade, or re-install the Stock Firmware (OS) in your Mobile Device. The Flash File (ROM) additionally lets you restore the Mobile machine, whether it is going through any Software Issue, Bootloop Issue, IMEI Issue, or Dead Issue.
File Name: G850YDOU2ANK2_G850YODD2AOB1_INU.zip
File Size: 1 GB
Android Version: 4.4.4
Flash Tool: Odin Downloader
How to Flash (set up): Follow Tutorial