[matejs]

I have installed a few modifications and don't want Amazon breaking it with OTA updates.

This is how I disabled the 'Settings -> Menu -> Update Your Kindle' and hopefully automatic updates too.

Requirements: Kindle Touch 5.0.3, jailbreak, root ssh

What it does: If you start update from settings, it logs a message about disabled OTA, the update*.bin file stays untouched. If you restart the Kindle, the update fails (error 3, press home to continue) and the update*.bin is deleted.

Instructions:
1) edit file /etc/upstart/ota-update.conf

Spoiler:

description "Intitates the OTA update process"

emits ota-update

export LANG LC_ALL

env BATTERY_MIN_CHARGE=15

env ERR_NONE=0
env ERR_BAD_ARG=1
env ERR_FILE_NOT_FOUND=2
env ERR_LOW_BAT=3

pre-start script
	source /etc/upstart/functions

	############## DISABLE OTA UPDATES ##############
	if [ -e "/mnt/us/DISABLE_OTA" ]
	then
		f_log E ota-update check "" "####################################################"
		f_log E ota-update check "" "# UPDATES DISABLED in /etc/upstart/ota-update.conf #"
		f_log E ota-update check "" "#   REMOVE FILE /mnt/us/DISABLE_OTA (in USB root)  #"
		f_log E ota-update check "" "####################################################"
		return $ERR_LOW_BAT
	fi
	############## DISABLE OTA UPDATES ##############

	[ -n "${BUNDLE}" ] || {
		f_log E ota-update check "" "BUNDLE not defined"
		return $ERR_BAD_ARG
	}

	[ -e "${BUNDLE}" ] || {
		f_log E ota-update check "" "No update file found"
		return $ERR_FILE_NOT_FOUND
	}

	set +e
	BATTERY_CHARGE=$(gasgauge-info -s)
	ERROR_STATE=$?
	BATTERY_CHARGE=$(echo "${BATTERY_CHARGE}" | sed 's/\%//')
	set -e
	[ -n "${BATTERY_CHARGE}" -a ${ERROR_STATE} -eq $ERR_NONE ] || {
		f_log W ota-update check "" "Gas guage info not available"
		BATTERY_CHARGE=0
	}
	
	set +e
	BATTERY_THRESHOLD=$(get-dynconf-value update.battery.threshold)
	ERROR_STATE=$?
	set -e
	if [ ${ERROR_STATE} -ne $ERR_NONE ] 
	then
		BATTERY_THRESHOLD=$BATTERY_MIN_CHARGE
	fi
	[ ${BATTERY_CHARGE} -ge ${BATTERY_THRESHOLD} -o -n "${FORCE}" ] || {
		MESSAGE="Inadequate battery charge, must be "
		MESSAGE="${MESSAGE} ${BATTERY_THRESHOLD} % or higher, "
		MESSAGE="${MESSAGE} currently at ${BATTERY_CHARGE} %"
		f_log W ota-update check "" "${MESSAGE}"
		return $ERR_LOW_BAT
	}

	return $ERR_NONE
end script

script
	# Issue the ota-update signal and wait for completion.
	initctl emit ota-update
	exec /usr/sbin/otaup "${BUNDLE}" > /dev/console
end script

2) create file /mnt/us/DISABLE_OTA (/mnt/us is what you see if you connect Kindle as USB mass storage)

To re-enable updates: remove or rename the file /mnt/us/DISABLE_OTA . (Or delete the modification from /etc/upstart/ota-update.conf)

As always, make backups and be carefull. No guarantees.