Default [Q] Efs files

anyone knows that is what brings each efs file because I lost 1 and take just 2 to 3 and when I use the phone without SIMCARD shows me the correct IMEI and when I put SIMCARD imei is null, I ran out signal kdz and put the stock via LG official update which is the automatic download and everything factory resets, but still no signal.. Is a e987, is any method to solve it?

I am able to get a m9kefs1.img from the same model and put in my phone, but i think it could create conflicts