Backup/Restore/Repair EFS Partition - Sprint HTC One (M8)

Is there a method where we can backup and restore the EFS partition?
Also as mentioned in this thread for Optimus G, is it possible to repair your ESN after zeroising it?

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Backup question

Hello
I made backup of my efs with the latest EFS professional 2.0.70. Do i need to backup something else, or does this EFS partion include everything i need? efs.img size is 20Mb. And yes i have galaxy s3 i9305. I have also backed up my rom using CMW.
Thanks
Basics
http://forum.xda-developers.com/showthread.php?t=2344125
Critical you read the first two posts .

[Q] efs backup needed without nvdata

i want an efs backup in img format without nv-data.bin i have my imei so no problem is in giving it as it does not leak your personal information like imei

efs showing 0 bytes in twrp

Hi I am facing problem that in twrp 2.6.0.0 efs is showing 0 mb but my efs is ok and phone is working I am unable to backup efs through trwp there are all files present in efs also my imei is null it sounds like another problem
Shumail Abaid said:
thankssss
Click to expand...
Click to collapse
For what are you thanking him?
qasim799 said:
Hi I am facing problem that in twrp 2.6.0.0 efs is showing 0 mb but my efs is ok and phone is working I am unable to backup efs through trwp there are all files present in efs also my imei is null it sounds like another problem
Click to expand...
Click to collapse
I used also TWRP for backup my efs and it show 0MB too but it did backup the efs. My backup took ~150KB.
By the way, the IMEI is NOT saved in efs partition. That what you think is IMEI, is really only a security key code for access IMEI (in /efs > imei). The real IMEI is saved in an another partition but i don't know where.
I think the security key code in your /efs > imei folder is wrong.
xXPR0T0TYPEXx said:
I used also TWRP for backup my efs and it show 0MB too but it did backup the efs. My backup took ~150KB.
By the way, the IMEI is NOT saved in efs partition. That what you think is IMEI, is really only a security key code for access IMEI (in /efs > imei). The real IMEI is saved in an another partition but i don't know where.
I think the security key code in your /efs > imei folder is wrong.
Click to expand...
Click to collapse
I need cspsa.img that is mmcblk0p9 so can you give me backup using adb

[q&a] efs backup help

I am trying to backup the EFS partition ? Is there any script or manual method to do this ? I tried a couple of apps but none support the L90.
TWRP

Looking for a qcn or efs backup for a N960U Sprint.

Attempting to rebuild my phone that I accidently formatted the efs partition on.

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