Reverse Engineering Firmware Primer (2012)

&gt; Some more greps that are useful:<p><pre><code> strings -8 40 | grep password strings -8 40 | grep backdoor strings -8 40 | grep &quot;\&lt;html </code></pre> The saddest part of this article is probably how often these greps will return results.

The cpio archive might be a initramfs, rather than the final root fs.