Default [Q] Efs problem/weak signal

hello i have a efs problem, i lose the folder and now i don't know what to do, i've been looking for a long time without answers, i wonder if anybody has an efs backup or something like that without imei number to use in my phone and get it back to life or can anyone tell me what can i do to fix it, i don't have a backup by the way, and i have weak signal who goes crazy and don't let me use my phone normally, please help me and sorry if i'm not so clear since english is not my native language, thanks in advance.
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