How to backup efs folder?

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http://forum.xda-developers.com – Tried efs pro not work As i know cwm do not backup efs folder Tried nitrality did not work We need to backup efs folder just to be safe while flashing as it contains imei and serial number etc and if lost we will lose connection both wi fi and 3g and our tab will be like a big ipod touch even without wifi (only media no internet or connection at all) Mohamed Selim (HowTos)