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Old 09-16-2016, 08:53   #1 (permalink)
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Samsung G850F - Destroyed IMEI, I have only cert file


Hello everyone.

I tried to unlock a G850F.
The phone unlocked but the IMEI erased from the phone.

I didn't keep any nv data backup, either efs. I have only the phone's cert file.

How can I restore the IMEI only from the cert file?
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Old 09-16-2016, 09:09   #2 (permalink)
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I have tried to flash cert file with Z3X with no results (still keeping null IMEI and S/N)
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Old 09-16-2016, 09:24   #3 (permalink)
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Post log from z3x,flash log,cert write etc.
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Old 09-16-2016, 09:29   #4 (permalink)
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I managed to restore S/N from the EFS file created during the unlock. But it didn't contain the IMEI.

----

Cert Write Log:
Checking certificate file... OK
KEY ID: 0932
Waiting ADB device... OK
Reading phone info...
Model: SM-G850F
Android version: 4.4.4
Product code:
Phone version:
PDA version: G850FXXU2BOA2
CSC version: G850FVFG2BOA1
CSC country code: Slovenia
CSC sales code: SIM
HW version:
Phone S/N: R58****B
Modem board:
RF cal date:
IMEI:
Checking Super user right... true
Reading nv data... OK
Checking magic... OK
Running zTool, please wait... OK
Detected new type of security version 0
Calculating... OK
Done with Samsung Tool v.20.5

---

Well, I moved an nv_data bin from another phone (G850F again) to efs directory, the phone now has Universal IMEI 004999010640000.
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Old 09-16-2016, 11:14   #5 (permalink)
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Now you need to write good cert,to have imei.
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Old 09-16-2016, 11:20   #6 (permalink)
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What do you mean good cert?

I write my IMEI's cert, as it has and it's own imei sign.
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Old 09-16-2016, 12:46   #7 (permalink)
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When you dial *#0011# does it say PASS?
If not try other working cert,you can find it on this forum.
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Old 09-16-2016, 14:36   #8 (permalink)
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Nothing is being showed when dialing this number.

As I said, I have no EFS backup (I only have one without IMEI) I dont have also no nv_data backup.

All I have for IMEI is a valid cert for my phone. (with correct IMEI and correct imeisign)

I have tried other certs without results.
I must have a SIM card inside the phone?
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Old 09-16-2016, 14:46   #9 (permalink)
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first of all DO HARD RESET then
flash phone with 4 file ROM
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Old 09-16-2016, 14:56   #10 (permalink)
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Quote:
Originally Posted by profkefah View Post
first of all DO HARD RESET then
flash phone with 4 file ROM
Hard Reset = Recovery wipe data?
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Old 09-16-2016, 15:18   #11 (permalink)
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yes

Recovery wipe data
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Old 09-16-2016, 15:23   #12 (permalink)
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Quote:
Originally Posted by profkefah View Post
yes

Recovery wipe data
Okay, I did it (wipe data + 4 files flash). But phone still not have IMEI.!
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Old 09-16-2016, 15:56   #13 (permalink)
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ok after that do root
then write cert
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Old 09-16-2016, 17:10   #14 (permalink)
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Quote:
Originally Posted by profkefah View Post
ok after that do root
then write cert
Well this method didn't really work BUT...

---

I managed to fix it!
What I did:

1. I had an EFS Backup, created automatically from Samsung Tool during the SIM Unlock. (This backup was without IMEI, but containing my cell phone's Serial Number)
2. I had also a cert backup as I said in the first post.
3. I wrote this EFS with Samsung Tool 20.5 . The result was correct S/N but null IMEI & unknown Baseband Version.
4. I downloaded Root Explorer, I entered the /efs folder, and deleted the nv_data bin file.
5. I rebooted the phone - the phone booted up with Universal IMEI (004999010640000), correct Serial Number, correct Baseband Version, in other words everything was correct except IMEI.
6. I downloaded Samsung Tool 19.1. I replaced version 20.5 with 19.1.
7. I wrote cert file with Samsung Tool 19.1. The phone restarted with correct IMEI (the original one) and unlocked. I did and a few calls just to be sure.

In conclusion, the Samsung Tool 20.5 has some bugs. When I flashed the cert file with 20.5, nothing happened, the phone had null IMEI, and sometimes it went into bootloops. Cert file MUST BE WRITTEN WITH SAMSUNG TOOL 19.1.

My firmware during this process: G850FXXU2ANI3 / OLB2ANI1 v4.4.4
(I downloaded 4 flash files as profkefah mentioned)
OS: Windows 7 Pro 64bit

Model: SM-G850F
Android version: 4.4.4
Phone version: G850FDXU1ANI1
PDA version: G850FXXU2ANI3
CSC version: G850FOLB2ANI1
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Old 12-15-2016, 18:51   #15 (permalink)
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-----------------------------------------------------------------------------------
Platform: Samsung Android
Selected port: COM19
Selected model: SM-G850F
Detected phone model: SM-G850F
Firmware compiled date: Wed Jun 17 21:00:32 KST 2015
PDA version: G850FXXU2COF4
CSC version: G850FVFGCOE3
SW version: G850FXXU1COF1
Phone SN: R58FA0Z9FYY
Android version: 5.0.2 (LRX22G)
Sales code: VD2
Country: Germany
HW platform: exynos5
HW Chip: exynos5430
HW Modem: XMM7260
Codename: sltexx
Checking Root:
Phone is Rooted.
Reading security backup, please wait...
Backup saved as C:\Program Files (x86)\Octoplus\Octoplus_Samsung
\BACKUP\Security-SM-G850F-Unknown15-12-2016_13-49-47-.asec
file
Executing exploit...
Exploit has been executed successfully
Unlocking phone. This can take some time. Please wait...
Phone is successfully unlocked
To finish the operation, please restart the phone via phone's menu.
Performed by 2.4.5 Software version.
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