Here You Will Find the link to Download Official Stock Firmware File for UMI X1S on Your PC or Laptop. All These File Firmware Comes in ZIP o RAR Package Containing Flash File, Required Flash Tool, Compatible USB Drivers and How to Flash Tutorial.
UMI X1S Stock Firmware (Flash File)
UMI X1S Stock Firmware (Flash File)
The Flash File will help you Upgrade, Downgrade, or re-install the Stock Firmware
(0S) on your Mobile Device. In addition, the Flash File (ROM) also enables you to
repair the Mobile device if facing any Software Issue, Bootloop Issue, IME Issue, or
Dead Issue.
File Name: UMI_X1S_20130528_PC.zip
File Size: 301 MB
Flash Tool: SP Flash Tool for Windows | SP Flash Tool for Linux
How to Flash (install): Follow Tutorial