Open on your PC. Place the custom TWRP recovery file ( .tar format) in the AP slot. Click Start to flash TWRP.
Go to Settings > About Phone > Software Information > Build Number . Look for the 5th character from the right. It must be 8 (e.g., G930FXX S8 ERJC or G930FXX U8 ERG2). You cannot downgrade a U8 device to U7 or lower firmware.
Before attempting the repair, ensure you have the following: Go to product viewer dialog for this item. with the latest software installed. A Samsung Galaxy S7 () on U8 Binary.
After changing the IMEI, the phone might still show "No Service". You need to patch the certificate to make the network work. On the Z3X tab, click on 'Patch Certificate' .
A rooted device (Rooting is often required for modem interaction). Correct USB drivers installed. enabled in Developer Options.