https://wiki.mobileread.com/wiki/Kindle4NTHacking
Download jailbreak from http://www.mobileread.com/forums/showthread.php?t=191158
https://www.mobileread.com/forums/attachment.php?attachmentid=141180&d=1439936080
- Connect Kindle via micro USB to PC
- copy the data.tar.gz, ENABLE_DIAGS and diagnostic_logs to the Kindle's USB drive's root
- Safely remove the USB device, remove the cable and restart the Kindle (Menu → Settings → Menu → Restart)
- Device restarts into diagnostics mode. Select “D) Exit, Reboot or Disable Diags” (using the 5-way keypad)
- Select “R) Reboot System” and “Q) To continue”, press 'FW Left' (left on 5-way keypad) to select an option
- Wait about 20 seconds: you should see the Jailbreak screen for a while, and the device should then restart normally
- After the Kindle restarts, you should see a new book titled “You are Jailbroken”, if you see this, the jailbreak has been successful.

SSH on jailbroken Kindle
http://www.mobileread.com/forums/showthread.php?t=88004
https://www.mobileread.com/forums/attachment.php?attachmentid=141341&d=1440341478
- copy Update_usbnetwork_0.57.N_k4_install.bin via usb to kindle root, then launch it by going to [Menu] → Settings → [Menu] → Update Your Kindle.
- reconnect kindle
- edit Kindle/usbnet/etc/config - set wifi to true, wifi_sshd_only to true, openssh true, volumd true
- add ssh keys to Kindle/usbnet/etc/authorized_keys
- enable pubkeys in sshd_config
- create file 'auto' in root
- configure wifi in [Menu] → Settings → Wifi
- reboot kindle

Note serial number from menu → settings → device info
https://www.sven.de/kindle/ → get root password from https://www.mobileread.com/forums/showthread.php?p=1873256
#!/usr/bin/env python
import hashlib
print(“fiona%s”%hashlib.md5(“XXXYOURSERIALXXX\n”.encode('utf-8')).hexdigest()[7:11])

writable root partition:
mntroot rw

KUAL
https://www.mobileread.com/forums/showthread.php?t=203326
https://storage.gra.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public/Touch/kindle-mkk-20141129-r18833.tar.xz
https://storage.gra.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public/KUAL/KUAL-v2.7.29-g7750a3a-20221017.tar.xz
disable wifi → aeroplane mode
copy mkk installer for K4 into root
copy v1 azw file into document folder
menu→settings→menu→update kindle

helper+ -> "prevent OTA updates"

https://storage.gra.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public/KUAL/kual-mrinstaller-1.7.N-r18983.tar.xz
https://storage.gra.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public/KUAL/kual-kual-plus-0.2.N-r13380.tar.xz
https://storage.gra.cloud.ovh.net/v1/AUTH_2ac4bfee353948ec8ea7fd1710574097/mr-public/KUAL/kual-gawk-1.5.N-r18977.tar.xz