Unbricking Kindle Paperwhite 2

This is a complete guide on how to unbrick/reflash Kindle Paperwhite 2 (PW2).
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Links:

Excellent Step by Step guide on how to reflash your Kindle Paperwhite 2: https://gist.github.com/TobiasWooldridge/22f0cdca75190b9a473f

5.4 for ROM images: http://www.mediafire.com/file/o55f4raa1aqi2lp/kindle_pw2_jb_5.4.0.zip/file

Fire & Kindle Software Updates: https://www.amazon.com/gp/help/customer/display.html?nodeId=200529680

Backdoorlock hack: https://www.mobileread.com/forums/showthread.php?t=205666

Custom screensavers hack: https://www.mobileread.com/forums/showthread.php?t=88004

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Error log:
...
Imx_epdc_fb imx_epdc_fb: unable to set VCOM = 250mV (err = -22)
Mxc_epdc_waveform_init: Unable to set VCOM = 0mV
Device spi0.0 removed
ERROR:insmod(/lib/modules/mxc_epdc_fb.ko) : init_module error: error 19 (19)
ERROR:eink_init: failed to load eink driver /lib/modules/mxc_epdc_fb.ko: error 19 (19)

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Music:
- Martijn de Boer (NiGiD) - My Happy Shadow
- Zep Hurme - Quarkstar inspiración

Видео Unbricking Kindle Paperwhite 2 канала E-LAB