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Flash your Samsung Jet on your own risks. Me and DarkForest Group will not be responsible if there's any problem during flashing process. But you may join Us in DFG for free to get help...Always read the flashing guide before any attempt for flashing, ONLY FLASH YOUR PHONE AFTER READING AND UNDERSTANDING THE FLASHING GUIDE

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Once again, Thanks to Dark Forest Group for this great info
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Example firmware S8000XEIL1

S8000 = Model
XE = The linguistic area
I = Year
L = Month
1 = Version of month

Common
BD Cyprus, Greece
CP Finland
DB Vietnam
DC Thailand
DD India
DT Australia
DX Indonesia, Malaysia, Philippines, Singapore, Vietnam
DZ Malaysia, Singapore
JA South Africa
JC Algeria, Morocco, Nigeria, South Africa, Tunisia
JP Arabic
JR Arabic
JV Algeria, Egypt, Iran, Iraq, Kuwait, Morocco, Nigeria, Oman, Pakistan, Saudi Arabia, South Africa, Syria, Tunisia, Turkey
MT Switzerland
XA Austria, France, Germany, Italy, Netherlands, Switzerland, United Kingdom
XB Denmark, Norway, Sweden
XC Portugal, Spain
XD Croatia, Czech, Hungary, Slovakia
XE Bulgaria, Estonia, Kazakhstan, Latvia, Lithuania, Russia, Ukraine
XF Bulgaria, Croatia, Romania
XP English, German, French, Italian, Spanish, Nederlands, Polski, Portugues and Turkish
XX Austria, Belgium, France, Germany, Hungary, Italy, Spain, United Kingdom, Denmark
ZC China, Hong Kong
ZH Hong Kong
ZT Taiwan

By Regional Category
Africa:
JC Algeria/Tunisia
JP/JR Arabic
JV Turkey

Asia:
DB Vietnam
DC Thailand
DD India
DT Australia
DX Thailand/Indonesia/Vietnam/Malaysia

Network Provider Code:
AD = O2, Austria
AE = SFR, France
AI = Tim, Italy
AM = Vodafone
AN = E-Plus, Germany
AO = O2, Germany
AS = KPN, Netherland
AU = Mobilkom, Austria
BB = Tmn, Portugal
BF = Optimus, Portugal
BG = Telefonica, Spain
BM = Swisscom, Switzerland
BN = Amena, Spain
BO = T-Mobile, Germany
BU = Vodafone
BV = Orange, Switzerland
BW = O2, United Kingdom
CD = Proximus, Belgium
CG = Telia Mobitel, Sweden
CH = SingTel, Singapore
CK = Tele2 Comviq, Sweden
CT = Tdc, Denmark
CU = One, Austria
CV = Telenor, Norway
DT = Optus, Australia
DV = Telstra, Australia
EF = Celcom, Malaysia
JB = Vodacom, South Africa
MD = Telia Sonera, Finland
MJ = Vodafone, Italy
MM = Tele Ring, Austria
MV = NetCom, Norway
NA = Nrj, France
NB = Tele2 Norway, Norway
NE = H3g Nordic, Sweden
NP = H3g, Italy
RF = T-Mobile
SS = Vodafone, Japan

Year:
A 2001
B 2002
C 2003
D 2004
E 2005
F 2006
G 2007
H 2008
I 2009
J 2010

Month:
A January
B February
C March
D April
E May
F June
G July
H August
I September
J October
K November
L December

Revision numbers:
1-9
Minor fix in firmware within a month

All Credits goes to DFG especially the Moderator and Admin

Join the largest Samsung Phone Community DARKFOREST By CLICKING HERE

Step 1 You must follow this step
1. Install NPS on your computer and make sure it will communicate with your phone.
2. Disconnect your phone and Close NPS.
3. Click "Start" or the Windows logo on the bottom left of your computer screen and click in the search/run box and type msconfig.
4. Select the tab marked "Start Up" and click "disable all" and click ok.
5. Restart the computer and you are ready to flash.

DO NOT! run NPS again until you have successfully flashed your phone! After you have successfully flashed your phone, you must reset the Windows setting back to there original and restart your computer.

-------------Now continue with the flash----------------

***Warning!***
Make sure your phone dose not have sim lock or net lock before you try and flash. Type *7465625 and make sure the SIMLOCK and NETWORKLOCK is OFF, if it is ON you MUST Unlock it or you will freeze your phone! Here is fast and trusted way! Network lock is not as big of risk as simlock, you have a 50/50 chance of bricking your phone if you flash with it on. You have a 100% chance of a brick if the simlock is on. Trust me, members make that mistake every day.

First thing to always remember, is BACK UP YOUR PHONE, Pictures,wallpapers,music, and any contacts you have saved on your phone. I am not responsible for any damage to you, your phone, computer, or lost of data in this process. This is a guideline intended for professional technicians.
USE AT YOUR OWN RISK!!!
What you will need:
1. USB cable that came with your phone.
2. New Samsung NPS

Install this software first, it contains the drivers for your phone, and has every thing you need for backup.

3. MultiLoader_V5.56 or Newer
4. New firmware

----------Now you are ready to begin------------

1. Make sure Samsung PC Studio is installed and communicates with your phone. And unpack the firmware in a folder you can easily find it.
2. Remove the Sim and MicroSD from your phone and replace the battery.
3. MAKE SURE THE PHONE IS OFF AND NOT CONNECTED TO THE COMPUTER.
4a. Touch Screen user : Hold down the "Volume -" button on the left or right side differs, and the "Camera" button on the right, then press the "Power" button = all three buttons need to be pressed together. Your phone should start up into a red\blue on black download screen.)
4b. For NON Touch and Slider phone users: While holding the no. 9 button on the phones key pad, tap the power button, the phone screen will come on black with a red stripe that says "Download"
5. Now run MultiLoader v5.56
6. Plug the phone up to the computer.

-----------Multiloader Steps--------------

1. Select the radio button Example: U900/Pixon/Tocco/S8300= MSM6275/MSM6280, FOR S5230= BRC2133, FOR JET= LSI6410
2. Select Boot Change
3. Full Download
4. Master rom
5. Then click Boot, and select the boot files from the unpacked firmware folder.
6. Select Amss
**NOTE** You must also select "APPS" if you are flashing a "JET" **NOTE**
7. Rsrc1
8. Rsrc2(Low) (Warning! Do not use Rsrc2 (Mid) your phone may not restart!!!)
9. Select the Factory FS file.

***FOTA and ETC fields are left blank.****

10. Click the Port Search button, it will find your phone and show the com port is ready.
11. Click the download button and be patient, this will only take a few minutes to complete.
12. When it's finished, it will show "ok complete".
13. Unplug the phone from the USB cable, reinstall the sim and SD card.
*** NOTE Some models and some will not, if yours does not restart at this point, take out the battery a few seconds then reinsert it. NOTE ***

14. Now with every thing is complete, You can perform a hard reset by typing *2767*3855 into the hand set (but not necessary.)
15. When the phone resets type *1234 into your handset to check your new firmware ver.

***NOTE!***
If your phone fails the flash for any reason, DO NOT TRY AND RESTART IT!!!!! Restart the computer and try the flash again! YES YOU MUST RESTART THE COMPUTER AND FOLLOW THE GUIDE CLOSE!

Where to get the latest firmware ?
You need at least to be a Free member of Darkforest REGISTER HERE to get the latest firmware.

ONCE AGAIN, ALL CREDITS GOES TO DARKFOREST FOR THIS GREAT AND USEFUL GUIDES

Tested with my current firmware (S800MDXJC1) and some of my previous Firmware. May also applicable on other Firmware

Enter Admin setting menu *5239870*
Enter Internal menu Master key *7092463*
Pre-configuration Code: *27236*

In Admin Settings, you'll see following menu :

1. Software Version
Displaying your Phone Firmware

2. Pre-configuration (Code: *27236*)
Option to change your Networks provider. All data will be erased

3. Network & call settings
Changing your network preference

4. Internals Master key (*7092463*)
Change GPS setting, Protocol, Storage,Java etc... Don't change any of this unless you know what are you doing or you'll damage your phone

5. Feature settings
Change your CPE setting and DRM Master reset

Always Backup your data before accessing this Menu
Do this on your own risks

For your information, I bricked my phone once after messing up with the Admin menu and took me a week to fix it. Luckily, I managed to repair my phone after reading some guidance from samsung phone largest community DARKFOREST

Listed here is some of Samsung S8000 / S8003 codes and their usage...May also be use on other model. Compiled from various sources and tested on my own Jet S8003 phone :

YOU TAKE YOUR OWN RISKS

Some advance Setting
*197328640 - internals menu without a password
*0228 - press 5/6 times on
-----------------------------------------------------------------------------
*7465625 - Check SIM lock , network lock etc.
*1234 = Firmware version
*06 = IMEI
*1111 = FTA SW
*2222 = FTA H/W
*03 = Unique number
*09 = white screen
*0* = the famous code for the test mode
*232337 = Bluetooth MAC Adress
*7465625 = verify simlock
*2767*3855 = E2P Full Reset
*2767*2878 = E2P Custom Reset
*0228 =battery info
*0289 = Melody test.
*0782 = Date and time
*0842 = vibrate test
*0673 = mp3 test
*0011 = Basic Information GSM
*7412359 = test radio

Settings codes

*782872 = Qualcomm USB
*726872 = Samsung normal USB
*4777*8665 = GPRS Test and config menu
*197328640 = Root debug menu
*2470 = Bip camera
*78 = (Tests Touch Config)

*7465625*638*Code = Activate Network lock
7465625*638*Code = Disable Network lock
SIMLOCK*NET*Code

*7465625*782*00000000 = Activate Subset lock
7465625*782*00000000 = Disable Subset lock
SIMLOCK*SUB*00000000

*7465625*77*00000000 = Activate SP lock
7465625*77*00000000 = Disable SP lock
SIMLOCK*SP*00000000

*7465625*27*00000000 = Activate CP lock
7465625*27*00000000 = Disable CP lock
SIMLOCK*CP*00000000

*7465625*746*00000000 = Activate SIM lock
7465625*746*00000000 = Disable SIM lock
SIMLOCK*SIM*00000000

*7465625*228 = Activate lock ON
7465625*228 = Activate lock OFF
SIMLOCK*ACT

*7465625*28638 = Auto Network lock ON
7465625*28638 = Auto Network lock OFF
SIMLOCK*AUNET

*7465625*28782 = Auto subset lock ON
7465625*28782 = Auto subset lock OFF
SIMLOCK*AUSUB

Will update more... Need to do some research again. :D
Hopefully I helped you with this