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So, assume that there are two Galaxy S3 phones (i9300)s. One of em has a "No Service", "Baseband Unknown" problem while the other works like a charm. Both of them are rooted and flashed with custom ROMs. (CM11 and CM12).

So, if the phone with proper /efs makes a nandroid backup of /efs and then that backup is restored in the phone having issues, then this should technically work.

Question is, will it?

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    I'm pretty sure that partition contains IMEI information and you do not want to be duplicating their phone on the network.
    – Matthew Read
    Mar 29, 2015 at 17:43
  • @MatthewRead Is there a way to change just the IMEI so it matches the one on my phone? (under the battery)
    – An SO User
    Mar 29, 2015 at 18:09
  • You may be able to hex edit the partition, but before you start messing with it and definitely before you attempt copying one to the other, back up the original /efs (with nandroid or dd) and definitely check out the laws in your country to make sure such activity is legal.
    – fattire
    Mar 29, 2015 at 22:42
  • @fattire have a look at EFS Pro. Using this, I can change the IMEI to my own, right?
    – An SO User
    Mar 30, 2015 at 14:59

2 Answers 2

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No, this won't work, because there is cant be two phones with same IMEI codes and every single phone probably has special modem codes so efs from one phone won't work in other phone

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Sometimes, when you have download a Rom, there is many files as you can see like :

  • PDA
  • PHONE
  • CSC

this is in ODIN. So, you need Modem or CSC for flash.

(But this is for Flash on Stock Rom and need 3 file).and also, for get back and test for need or not need Z3X box, just back to Stock rom and tell us your problem is solved with Stock or not.this texts are, for more information.and help you for install Stock without this problem.anyway.

As i said in chat, take a backup from efs (from worked device) and install it with recovery.

technically, it will work.But, this is sometimes Harassment you and need money for solved with z3x :)

hope your problem solved with flash efs.

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