Lost IMEI and efs folder R/O

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http://forum.xda-developers.com – Hi guys I'm having a strange problem with my sister's galaxy s2. For the second time she lost her IMEI without any reason (no flash ecc just turned off the phone and no IMEI when turned on). The last time I've been able to restore it and I made all the backups using efs pro, But this time when I try to restore it the procedure goes well but the imei is still missing. I tried to restore it manually and I discovered that for some reason the EFS folder is blocked on READ ONLY and I can't switch it in R/W. This problem is preventing me to restore the IMEI and I can't find any similar case on googl (HowTos)