NVRAM Remains in data partition. Then why IMEI is not lost after data reset?

closed as unclear what you're asking by bmdixon, Izzy, Matthew Read Nov 2 '15 at 17:08

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  • 2
    Isn't the IMEI in /efs? – Thomas Vos Jun 24 '15 at 18:50
  • @SuperThomasLab AFAIK /efs is a Samsung specific partition. Never read about it for other devices (but didn't check either). – Izzy Jul 6 '15 at 13:47

The IMEI is the International Mobile Equipment Identification, which you MUST have to connect to the cellphone network. If you don't have an IMEI you can't call anybody.

The IMEI isn't wiped by performing a data reset because it is being held in a separate partition called /efs, modem or modemst - the Name of the partition depends on your phone's brand. That partition is not touched by the reset-option.

It happens sometimes that the IMEI is lost after a Bad flash. But I wouldn't try to force it because your phone will refuse to connect to the network. Also IMEI hacking is illegal in some countries.


  • Not every device seems to have an efs partition, not at least my Mediatek device has. – Firelord Jun 26 '15 at 6:17
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    Then it could be that it is has a different name. I think /efs is Samsung related. My Z2 also seems to have no /efs partition – TechMod Jun 26 '15 at 6:31
  • So where is it in different devices... – Thomas Vos Jun 26 '15 at 6:56
  • I do not know. But it could be in some folder called modem, modemst or something similar. Since I dont worry about my IMEI i dont care where it is. Also, as I mentioned above, IMEI hacking is illegal in some countries. – TechMod Jun 27 '15 at 8:16

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