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Possible Duplicate:
How can I restore IMEI code after factory reset?

I have an SGS2. During an OTA update the IMEI was deleted. I didn't have a backup of the EFS directory, as the phone wasn't rooted. However, I copied down the IMEI on paper beforehand.

Is there any way to restore the IMEI if I have the number?

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marked as duplicate by roxan, Izzy, Al E., Chahk, Zuul Sep 21 '12 at 3:43

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Start here with this answer to an exact duplicate of your question. – zero2cx Sep 19 '12 at 23:11
@zero2cx you should flag it as duplicate :) – roxan Sep 20 '12 at 5:07
I don't think it's a duplicate, because these things are very phone-specific. – silent_cookie Sep 20 '12 at 11:37
It's specific to Samsung Phones because they store the IMEI in the /efs/ folder – silent_cookie Sep 20 '12 at 19:05

I've a Samsung Galaxy S1, but it will probably also work for you...

What I did, I flashed a Stock ROM via ODIN with Re-Partition enabled. (Don't know if it's necesseary) The stock ROM automatically regenerated my EFS-Folder and my IMEI... (See the Thread here)

This worked for me, but this might also help you.

I don't know any way to restore your IMEI, just because you know it. (It's written behind your battery anyways) The EFS-Folder which stores the IMEI is encrypted.

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