ZTE Concord II Z730 Stock Firmware (Flash File) The Flash File will help you Upgrade, Downgrade, or re-install the Stock Firmware (OS) 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, IMEI Issue, or Dead Issue. File Name: ZTE_Concord_II_Z730_20112015_TMO.zip File Size: 387 MB How to Flash (install): Run ZTE One Key Upgrade Tool(Z730V1.0.0B19 to B20) for TMO Setup.exe and follow screen instructions. Mirror 1 (Free)Mirror 2 (Paid)