Backing up EFS on Galaxy S4


  1. yuriman1

    yuriman1 Member

    Hi there,
    I am going to flash cyanogenmod on my Galaxy S4 GT-I9505. But i read that i have to back up some data. I tried to use "EFS Professional" but though i confirmed that popup where it says something with "RSA fingerprint" and the SU request, knox blocks it. So this way seems not to work.

    Now i just installed "root explorer" and manually back up the efs folder. It seems very small. Is that enough?

    [​IMG]

    Can i flash now?

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  2. yuriman1

    yuriman1 Member

    push :D
    i can't stand this samsung stock ROM anymore.
  3. Shotgun84

    Shotgun84 Well-Known Member

  4. yuriman1

    yuriman1 Member

    Can i use that though i have twrp installed?

    i also did a backup with twrp and selected the efs partition, but it's so small, too.
  5. Shotgun84

    Shotgun84 Well-Known Member

    You would need to replace twrp with philz. In my opinion philz is better anyway so it shouldn't be too much of a problem.
  6. lotus49

    lotus49 Well-Known Member

    What is in the EFS folder and why does it need to be backed up?
  7. Shotgun84

    Shotgun84 Well-Known Member

    It contains your imei number so if it gets wiped while flashing (not very common but has been known to happen) you won't be able to use your phone except as a Wi-Fi device.
    dynomot and lotus49 like this.
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