you will be Search the official link to download UMI Iron Stock Firmware ROM (flash file) on your Computer. Firmware comes in a zip package, which contains Flash File, Flash Tool, Driver and How-to Manual.
Download UMI Iron Stock Firmware (flash file)
File Name: UMI_Iron_Y900_V0.04_20150626_1750.zip
File Size: 578 MB
How to Flash: Follow Tutorial
How to Flash
Step 1: Download and extract the UMI Iron stock firmware on your computer.
Step 2: After extracting, you will get the Firmware File, Flash Tool, Driver and How-to Flash Guide.
Step 3: Install the USB Driver on your Computer (skip if drivers are already installed).
Step 4: Follow the How-to Flash Guide to Flash the Firmware on your UMI Iron Device.
[*] Take a Backup: If you are going to flash the above Firmware on your UMI Iron device, then take a backup of everything as because your personal data will be deleted after flashing the stock firmware.
[*] The firmware shared on this page is officially released by the company and helps you to recovery your device if you ever got bootloop, software error, update error, hanging and dead issue.