Tutorial FW >= 5.11 Factory JailBreak (i.e., KT4)

This assumes you are *already* running a *factory* firmware version. Refer to the JailBreak Index for more details.

First, download the K5 Factory JailBreak package from the Snapshots thread, then unpack it.

The instructions are then mildly different depending on the exact version of said factory FW.

If it's >= 5.11:

Copy the Merchant.zip file as-is (i.e., don't unpack it) to the top level of the visible USB storage, and then eject & unplug your Kindle.
In the search bar, type ;merchant and press return.
The device should then reboot automatically.
A You are Jailbroken document will appear if the process was successful.
If everything went according to plan, you can now safely delete both that document and the Merchant.zip file, and follow the rest of the directions from the JailBreak Index.

If it's < 5.11:

Copy the main-htmlviewer.tar.gz file as-is (i.e., don't unpack it) to the top level of the visible USB storage, and then eject & unplug your Kindle.
In the search bar, type ;installHtml and press return.
The device should then reboot automatically.
A You are Jailbroken document will appear if the process was successful.
If everything went according to plan, you can now safely delete both that document and the main-htmlviewer.tar.gz file, and follow the rest of the directions from the JailBreak Index.