Obi S507 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: Obi_S507_6FA6_ZP1_P5002.zip File Size: 779 MB How to Flash (install): Run 6FA6-ZP1-P5002-Flashtool.exe and once tool is loaded with firmware connect your device and click on flash button. (Mediafire)