Table of Contents

This page is a work in process.

Docomo Phones by Casio

Check the dumping hardware overview for a list of known preservation hardware.

If you need help, please come chat with us on the VGPC or No-Intro discord servers.

Introduction

Casio only released two feature phone models for SoftBank: the 830CA and 930CA.

Phone Model File System/FTL Tools
830CA JFFS2 Jefferson
930CA JFFS2 Jefferson

Methods

Extracting Data

  1. ktdumper

Reading File Systems

  1. Jefferson

Ktdumper

Ktdumper is a tool for extracting data from feature phones that are compatible with the Foma debug adapter, which includes all Docomo phones and select SoftBank phones. Please note that ktdumper will not work unless you have the Foma debug adapter.

Ktdumper is compatible with Linux and WSL (Windows System on Linux). It can be used as a command line tool or as a live Linux iso with a GUI.

Ktdumper Command Line

  1. Make sure your phone is connected to the PC (if using WSL, you will need to bind your USB device)
  2. Download the ktdumper repository from Github
  3. Navigate to the main ktdumper folder, where the code will be executed.
  4. You can execute the following commands
  • NAND (contains user data, downloads, etc.) 
    sudo ./ktdumper.sh [insert phone model] dump_nand
  • NOR 
    sudo ./ktdumper.sh [insert phone model] dump_nor
  • JAVA Folder (only works on select Mitsubishi/Fujitsu phones) 
    sudo ./ktdumper.sh [insert phone model] dump_java

Sample For D904i 

sudo ./ktdumper.sh d904i dump_nand

Ktdumper Live Iso

WIP

Reading Data

Jefferson

The JFFS2 file system can be extracted with Jefferson, which runs on Python. You can install Jefferson in a pre-existing Python using pip: 

sudo apt-get install python3-pip
sudo pip3 install jefferson

The following command creates a folder called “jffs2_extracted” to contain the data extracted from nand.bin. 

sudo jefferson -d jffs2_extracted nand.bin

Note: You may see the error 

data_crc does not match!

The dump may still be working. Let it continue until the process is complete before trying other steps.

Troubleshooting

If the jffs2_extracted folder contains no data, the offset will need to be removed from the .bin file.

You can determine the offset two ways: 

binwalk nand.bin
85 20 19 E0

Or 

85 19 02 E0

Delete all data before those four bytes and try again to extract with Jefferson.

Note: It is not possible to undelete files from a JFFS2 file system.

Gathering and Submitting Dump Info

Once you've dumped your games, it's time to generate and submit metadata to a preservation project for validating and cataloging. See the dump submission instructions for more information.