Once written, type your phone's physical original IMEI (printed on the rear glass shell or battery tray) into the software's input block.
When you back up the EFS partition using TWRP, you get an efs1.img and efs2.img or a efs.tar file. Inside that backup lives the NV data. sm-g920t nv data file
: Under specialized testing menus or service tools, the security check reads "NG" (No Good) instead of "OK". Once written, type your phone's physical original IMEI
: Used to fix "Invalid SIM" or network signal loss after a bad flash. : Under specialized testing menus or service tools,
If you own a — the T-Mobile variant of Samsung’s 2015 flagship — you might have come across a frustrating problem after a failed custom ROM flash, a bad root, or a software update. Suddenly, your phone shows “No Service,” “Null IMEI,” or “Unknown Baseband.”