[Galaxy S III I9305 (4G LTE + 2GB RAM) Q&A, Help & ] SurrendeR1993:
Okay everybody,

I decided to write a new thread for my problem because I think my prob is a very special thing.

I'm from germany, so please don't wonder about my english. I think it is a understandable.

The story begins with a software update for my GT-I9305. After the update, the IMEI was just "null", after some work with google I found out that the efs partition was broken. With my bad knowledge for this case, I destroyed the whole EFS folder. I installed perseus kernel. And, there it was! The whole and correct IMEI. The solution was the perseus kernel (stock doesn't work, neither reflash). But then, after a while the phone doesn't boot anymore. I flashed Android 4.4.4 and my phone was revived but the IMEI was again "null".

I have no backup or anything else!

So I spent approximately 20 hours or more to understand the efs thing. I found much solutions but nothing worked for me. So, here I am.

What I've tried before

-reflash KitKat

-reflash Perseus (not compatible anymore)

-formatting efs partition for a blank and new EFS for editing

-tried to edit nv_data.bin with HEX

-tried to backup efs with a 3rd party app and edit this with hex (the app doesn't support my GT-I9305)

and then, there it was:

-tried to use a working EFS partition from another GT-I9305

-editing with Qualcomm NV Tools! (I think THIS is the solution!)

I tried NV-items_reader_writer (1.0) and EFS Professional (2.1.73), but in both can't find my phone:

What I've done in NV-items_reader_writer

-dialed *#7284#

-at "Qualcomm USB Settings": "RNDIS + DM + MODEM"

-enabled USB Debugging in phone

-connected the phone

-opened NV-items_reader_writer

-checked the both boxes near the SPC box

-selected the right port (last: COM4)

-clicked on "connect"

-clicked on "read"

-> here it search the phone, but it can't find it and says "Failed.. Phone does not answer"

What I've done in EFS Professional

-dialed *#7284#

-at "Qualcomm USB Settings": "RNDIS + DM + MODEM"

-enabled USB Debugging in phone

-connected the phone

-opened EFS Pro

-clicked on "Qualcomm NV Tools"

-refreshed the Available COM Ports

-selected "SAMSUNG Mobile USB Serial Port" (last COM4)

-clicked on "Connect"

-> Here it takes few seconds and he stops and says: "Phone connection has been lost!" and "Unable to send SPC to the Phone!"

What I've tried to solve this problem

-tried QUALCOMM USB Settings: "DM + MODEM + ADB"

-reinstall all Samsung drivers

-tried to install Samsung Modem with Qualcomm drivers (failed due to wrong platform; I've Win7 X64)

-reinstall Samsung Kies (for actual drivers)

-tried to dial *#9090# (in my case, this menu is totaly blank)

-tried in factory mode

It could be that I forgot some....

Now, my question to you all is, do you know what I've done wrong? I mean, this is working for the most users, but why not for me? What do you think? Did you think I really forgot something?

Some informations:

Phone: GT-I9305

Android: 4.4.4 KitKat

Kernel: Stock (3.0.31-2760029 ; dpi@SWDD6202 #1 ; Fri Sep 12 13:08:24 KST 2014)

Buildnumber: KTU84P.I9305XXUFNI3

Windows: Windows 7 X64

Do you need more informations? Post it!

Please help me, I want to bring this phone back to life!

And yes I know, to change the IMEI to a number which is not your own is ILLEGAL and to prevent this, it is not well seen to talk about, but this is MY PHONE and I want to change the "null" IMEI and IMSI to MY ORIGINAL IMEI. If this is a problem, I can send a PM to an mod with my phone (where you can see the IMEI), my username on a sheet of paper and the original box with the IMEI printed on. All on one picture!

Simply... I need a hero! Be MY HERO!