Samsung A 900 mastercode

Supported Models:
A900 ESN changer

How To Use
SPH-A900 ESN Change

First connect the A900 in the QPST EFS Explorer 2.7

Connect First A900 phone in QPST EFS Explorer of 2.7 program

We put the spc and entered the nvm folder \, seeking the $ SYS.ESN

Put spc and enter in nvm folder, search $ SYS.ESN

Copy the file $ SYS.ESN to your desktop and open it with a hex editor (ultraedit32, hexedit, Hx workshop) I use UltraEdit.

Copy the file $ SYS.ESN to desktop and open with Hex editor, i use ultraedit32

We read the ESN backwards in groups of two, in the above example would

20F945CF, and as 16FB8F3E cheksum

Read ESN in copulate of digits, invest, in example esn is: 20F945CF and checksum 16FB8F3E

Now use the calculator for the new esn checksum, for example 20304050

Now use checksum calculator for the new esn, by example 20304050

And edit the file in hexadecimal

And edit file in hex.

ESN 20304050 50403020 Esn for edit

Checksum for edit 25B0BE0A 0ABEB025 Cheksum

Save the file and we went back to the EFS explorer $ SYS.ESN replacing the original file on the edit

When you restart the cel will have the new esn.

Save the File and upload again EFS Explorer to replace the original $ SYS.ESN by the $ SYS.ESN editef

When subtracting phone, phone have new esn.
Use it in accordance "with your local Laws
Samsung A900 ESN Changer / Rebuild

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