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How to Unbrick a Kindle Paperwhite

How to unbrick an Amazon Kindle Paperwhite™

This guide instructs you in how to unbrick an Amazon Kindle Paperwhite. The consequences of following it are your own responsibility. This method (opening the Kindle and using the serial interface) should be a last resort and should only be considered if other methods fail

The Guide

  1. Pry open Kindle using a prying tool

  2. Unscrew the screen and remove it from the base. Note that there's a screw hidden under the adhesive at the top in the middle

  3. Solder tin wire to serial ports on the bottom

  4. Attach tin wire to USB TTY device (order is ground, RX, TX, from the kindle's perspective, where GND is the smallest pad) and plug USB TTY device into your computer

  5. Open Putty on your computer in serial mode, with the serial port specified as your USB device and baud configured to 115200

  6. Reboot kindle

  7. When the kindle is booting, there exists a brief window where sending data to it over the serial line will cause it to enter it's bootloader. To achieved this I repeatedly pressed enter on my computer's keyboard as my kindle started booting

  8. Now that we're in the bootloader, run 'bist fastboot' to put your Kindle into fastboot mode

  9. On a Mac, build https://github.com/TobiasWooldridge/Fastboot-Kindle (On Linux, you can compile by running make linux) -- if you get this building on anything else, please send me a pull request :)

  10. In bist, run 'fastboot' (if it isn't running already)

  11. Make sure Kindle Paperwhite is plugged in to your Mac/Linux by USB as well

  12. On your Mac, run ./fastboot (Be careful not to run fastboot, as that may use an installed Android fastboot binary). This will list the paritions on your Kindle Paperwhite

  13. From this point you have two choices, either install amazon's offical paperwhite system update (method described below) or continue these steps.

  14. We want to overwrite diags_kernel, main_kernel, system and diags

  15. We now want to run

    ./fastboot flash system pw_5.2.0-mmcblk0p1.img
    ./fastboot flash kernel pw_5.2.0-main_kernel.img
    ./fastboot flash diags pw_5.2.0-mmcblk0p2.img

to flash all of our images to the Kindle Paperwhite EXCEPT for the main system image

  1. Run the following to reboot your Kindle and get into Diags mode
    ./fastboot setvar bootmode diags
    ./fastboot reboot
  1. Once your kindle's booted to diags mode, start USB mode

  2. Rename pw_5.2.0-mmcblk0p1.img to mmcblk0p1.img and copy it to your kindle

  3. Safely unmount your kindle

  4. Reboot your kindle into diagnostics mode again from the "Exit, Reboot or Disable Diags" menu

  5. If you're watching your Kindle's serial output as it boots, you should see something like

    /dev/loop/0: 84 files, 44940/174079 clusters
    info filesystems:installdata:KINDLEFIX looking for /mnt/us/mmcblk0p1.img ...:
    info filesystems:installdata:KINDLEFIX found mmcblk0p1.img, trying to install:I
  1. This indicates that it's flashing the system partition. It will take a while, during which the Kindle will only show the Amazon Kindle screen

  2. Once diags mode has booted, open "Exit, Reboot or Disable Diags", hit disable diagnostics, then hit continue. This will reboot your kindle.

  3. Hooray! Your kindle is now unbricked.

  4. Optionally delete the mmcblk0p1.img on your Kindle over USB. If you leave it there, every time the diags tool is run, it'll flash it to the system partition.

How to modify pw_5.2.0-mmcblk0p2 to automatically dd pw_5.2.0-mmcblk0p1 to the system partition

Unfortunately pw_5.2.0-mmcblk0p1 is too big for fastboot (or, fastboot doesn't like it for some reason). This causes us a little bit of grief because we need to use some other means to get it onto our kindle

We'd usually use the 'dd' tool on the kindle over ssh to copy this file to its respective partition; however, Amazon has removed the diagnostic partition's ssh application, so we can't use that to copy the file to the kindle and dd it.

Instead, we'll just mangle the diagnostic image to 'dd' the file after it's done initializing filesystems.

To do this,

  1. Back up then mount the diagnostic image to some directory
    cp pw_5.2.0-mmcblk0p2.img pw_5.2.0-mmcblk0p2.img.bak
    mkdir mmcblk0p2
    root@debian:~# mount -t ext3 pw_5.2.0-mmcblk0p2.img mmcblk0p2/
  1. Open its /etc/upstart/diags file (the diagnostics boot script)
    vim mmcblk0p2/etc/upstart/diags
  1. At the end of init_filesystems function, before the "#end script" comment, add
    # INSTALL MAIN PARTITION FROM USERSTORE
    f_log I filesystems installdata "KINDLEFIX looking for /mnt/us/mmcblk0p1.img ..."
    if [ -e /mnt/us/mmcblk0p1.img ] ; then
      f_log I filesystems installdata "KINDLEFIX found mmcblk0p1.img, trying to install" I
      dd if=/mnt/us/mmcblk0p1.img of=/dev/mmcblk0p1 bs=4K
      f_log I filesystems installdata "KINDLEFIX Install successful" I
    fi
  1. Unmount mmcblk0p2
    umount mmcblk0p2/
  1. Now when we flash pw_5.2.0-mmcblk0p2.img, it'll automatically check the userstore directory for a file named 'mmcblk0p1.img' and flash it to the system partition

Alternative method using amazon update file

  1. Download latest version of your amazon paperwhite's update file

  2. Run the following to reboot your Kindle and get into Diags mode

    ./fastboot setvar bootmode diags
    ./fastboot reboot
  1. Once your kindle's booted to diags mode, start USB mode and mount your kindle
  2. Copy the update file to your kindle and call it update.bin
  3. Safely unmount your kindle
  4. Reboot your kindle into diagnostics mode again, you should see the system installing your update file
  5. When it finish, go to "Exit, Reboot or Disable Diags" menu and hit disable diagnostics, then hit continue. This will reboot your kindle.
  6. Hooray! Your kindle is now unbricked.

Misc

If you find this useful or find an error, feel welcome to leave a comment below or email tobias@wooldridge.id.au - thanks!

@deixaeudormir

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commented Mar 31, 2019

todos esses processos são possíveis a partir de um Mint 19 de um usuário iniciante?

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