+ First backup all data to PC and should "Hard Reset" to flush Memory.
+ Flash your F180S/L/K to 4.4.2 stock V30B/C : http://lg-phone-firmware.com/index.php?id_mod=20
+ Root the phone with this : http://forum.xda-developers.com/show....php?t=1941699 then install "SupperSu" from Playstore
+ Backup your IMEI with this tool (Use "Backup_Imei.bat") : http://www.mediafire.com/download/0rd2wm6wgek6jlu ; After backup Imei copy Folde "Backup_Imei" to safe location.
+ Flash again with E975 V20A stock
+ Root again
+ Copy back folder "Backup_Imei" to phone memory
+ Rum "Restore_Imei.bat"
+ Install "SQLite editer" from Google play to open "settings.db" in location "Data\data\com.android.providers.settings\database s" select "global" -> find "subscription_mode" change value "1" to "0" then save and exit.
+ Reboot Phone and Signal will back with any F180S/L/K with E975 Kitkat Rom
Boom F180K/S/L convert to E975 Stockrom will have singal (3G/2G), SMS with 3G/2G too - I'm not tested LTE
LTE also work too, thank for reported
My F180K work suscess with this
Fixed can't send SMS
Still my bug please someone fix : I'cant sent SMS
Thanks VTD to most tool I've use
Souce : http://choimobile.vn and http://lgviet.vnG and