template:jffs2 [dumping.guide]

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The JFFS2 file system can be extracted with [[https://github.com/sviehb/jefferson|Jefferson]], which runs on Python. You can install Jefferson in a pre-existing Python using pip:
<code>sudo apt-get install python3-pip
sudo pip3 install jefferson</code>

The following command creates a folder called “jffs2_extracted” to contain the data extracted from nand.bin.
<code>sudo jefferson -d jffs2_extracted nand.bin</code>

Note: You may see the error
<code>data_crc does not match!</code>
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:

  * Using binwalk, look for the address where the JFFS2 file system begins.
<code>binwalk nand.bin</code>
  * Using a hex editor such as HxD, look for the following four bytes:
<code>85 20 19 E0</code>
Or
<code>85 19 02 E0</code>

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.