Making a Kindle 4 device show your own screensavers (and no advertisement) - on Linux !!

In this tutorial I will tell you how to make your kindle show custom screensavers using linux. I decided to write this post because all the tutorials I found were for windows users and none of them had all the steps in one place.
(I know that disabling the advertisements have philosophical implications because amazon supposedly used them to lower the price of your kindle, but...)
 Enjoy!!

1. Plug in your kindle, mount it and create an empty file called ENABLE_DIAGS on the main directory:

$ touch ENABLE_DIAGS

2. Reboot kindle and go through debug menu system to start USB networking:

To restart your kindle: 

1. Press "HOME" button
2. Press "MENU" button
3. Select the "Settings" option
4. Press "MENU" button
5. Select the "Restart" option

After your kindle restarted it will show a menu where you can adventure yourself  (And I don't know if you can brick it or not) using the cursor pad.

To enable USB networking:

1. Scroll to "Misc individual diagnostics"  & select
2. Scroll to "Utilities" & Select
3. Scroll to "Z> Enable USBnet" & Select
4. Screen should show various "addresses" and "PASS" and highlighted on "X> Exit..."
5. Select "X> Exit - FW RIGHT to exit"
6. Back out by selecting "X> Exit - FW RIGHT to exit" until main screen

3. Now you can ssh to your kindle:

$ ifconfig usb0 192.168.15.1; ssh root@192.168.15.244

Maybe you will need to run the ifconfig with root privilegies.
The user ID is "root" and the very hard password, almost impossible to crack, is "mario" 

4. (If your kindle is not "with special offers") Create your own screensaver directory and make kindle point to it:

$ mntroot rw
$ mkdir /mnt/us/screensaver
$ mount /dev/mmcblk0p1 /mnt/base-mmc
$ mv /mnt/base-mmc/opt/amazon/screen_saver/600x800 /mnt/base-mmc/opt/amazon/screen_saver/600x800.old
$ ln -sfn /mnt/us/screensaver /mnt/base-mmc/opt/amazon/screen_saver/600x800

4. (For kindle "with special offers") If you want to remove all the advertisement and use your own screensaver just backup the advertisement folders and repeat the previous steps:

$ mntroot rw
$ mount /dev/mmcblk0p1 /mnt/base-mmc

$ mv /mnt/us/.assets /mnt/us/.assetsBCKP
$ mv /var/local/adunits /var/local/adunitsBCKP
$ mv /mnt/base-mmc/amazon/screen_saver/adunits/600x800/banner.gif /mnt/base-mmc/amazon/screen_saver/adunits/600x800/banner.gif.BCKP
$ mv /mnt/base-mmc/amazon/screen_saver/adunits/600x800/screensvr.gif /mnt/base-mmc/amazon/screen_saver/adunits/600x800/screensvr.gif.BCKP

$ mkdir /mnt/us/screensaver
$ mv /mnt/base-mmc/opt/amazon/screen_saver/600x800 /mnt/base-mmc/opt/amazon/screen_saver/600x800.old
$ ln -sfn /mnt/us/screensaver /mnt/base-mmc/opt/amazon/screen_saver/600x800

5. Restart your kindle

1. Select "D> Exit, Reboot or Disable Diags"
2. Select "D> Disable Diagnostics"
3. Select "Q> To continue - FW LEFT" by pushing the FW LEFT button
4. Kindle should reboot itself - be patient

6. Now, when you mount your kindle it will have a directory called "screensaver" where you can put any .jpg or .png files (preferably with a 600x800 resolution with 16-gray color)

6.1 If you want to have more than one screensaver and make it change randomly create an empty file at the screensaver directory called "random"

$ touch random

7. Have fun putting your own screensaver or finding one in the following sites:

http://kindlewallpapers.tumblr.com/
http://kindlepics.deviantart.com/gallery/
http://www.kubizo.com/

That's all folks!

For all this to be possible I have used all these sites:
http://yifan.lu/p/kindle-touch-jailbreak/
http://wiki.mobileread.com/wiki/Kindle_Touch_Hacking
http://www.mobileread.mobi/forums/showthread.php?t=161284
http://juanchorossi.com/remove-kindle3-screensavers/
http://www.mobileread.com/forums/showpost.php?p=1876617&postcount=95
http://pastebin.com/17czdUS7