How To use IDA To disasm NOKIA DCT4 flash by kontact

[watusi2]

http://www.cracklab.ru/download/list.php?l=1

yes, learning how to disasm will help us make or learn or find info on gsm programming.


some tips on disassembling mcode.app /SIS. don't use ida 4.8. since i try and saw that the import func names are not being imported. use ida 4.6.

regards

2.--------------------------------------------------------------------------------

Hello

Requirements:

1.You must have decr.exe the CrypterX by Nok5rev and G3gg0. to decrypt DCT4 flash file and to Encrypt.
2. IDA Disasm software. (any ver will do )
3. Time and efforts.

run ida. load the file on ida.
then u will see the first image1 and image2. just follow it and all will be disassemble.

hope everyone will have fun. more to come...

regards


3.Hi,

Dct3/4 flash files MCU part is ARM/THUMB.

now after loading the dct4 decrypted flash files on ida. goto offset 0100.0100 that is the entry point of the ARM_main. All starts from there. u can press C while the cursor is focus on the said address and u will see something like this'

ROM:01000100 loc_1000100 ; DATA XREF: ROM:01000078o
ROM:01000100 ; sub_109ADD8ff_109AEECo
ROM:01000100 B loc_1091A00 // a jmup to the arm_main routine

then follow that B loc_1091A00 and so on. Pressing C if you only see hexes. to convert it to ARM opcodes.

here are the arm/thumb quick ref chart.

regards

visit here....http://www.blutacgsm.net/forums/showthread.php?t=62

[Zaihtam]

Conclusion:

1. Use "ARMB" processor type
2. ram size 0x80000
3. rom address start 0x1000000, load it at 0x1000000
4. Entry Point 0x1000100