PW4 serial port jailbrek kindle paperwhite4 5.11.1 can‘t stop autoboot

[5231251]

Hello Everyone！
As the title show，i want to jailbreak my kindle paperwhite4 on the firmware 5.11.1；but when the screen show “Hit any key to stop autoboot” ；i press、hit
any key do not work；
Can someone tell me how to do！

Here is the screen show：

info shutdown:begin:level=6,halt=,special=:level=6,halt=,special=
info shutdown:closing password dialog::
info blanket_f:loading blanket module:shutdown:shutdown
info shutdown_showimage:screen:splashing screen:splashing screen reboot
info shutdown_showimage:screen:waiting for reboot screen to come up:waiting for reboot screen to come up
info milestone:154.05:pi00:pi00
info milestone:154.12:pi99:pi99
info upstart_f:stopping_job:job=x:job=x
info upstart_f:stopping_job:job=wifid:job=wifid
info stored:post-stop script - Time Interval = 75::
info stored:post-stop script - cleared counters::
info upstart_f:job_already_stopped:job=wifis:job=wifis
info stored:post-stop script - sending event to appmgrd::
info upstart_f:stopping_job:job=lab126:job=lab126
info demd:stopped...::
info milestone:155.82:pm99:pm99
info upstart_f:job_already_stopped:job=framework:job=framework
info upstart_f:stopping_job:job=sshd:job=sshd
info upstart_f:job_already_stopped:job=usbnetd:job=usbnetd
info upstart_f:job_already_stopped:job=testd:job=testd
info upstart_f:jobs_stopped:elapsed_ms=4560,timeout_ms=60000:elapsed_ms=4560,timeout_ms=60000
info upstart_f:stopping_job:job=filesystems:job=filesystems
info filesystems_var_local:unmounting font files::
info filesystems_userstore:unmount_userstore:Unmounting UserStore:Unmounting UserStore
info filesystems_keys:filesystem sync done::
info filesystems_keys:unmount_keys:Unmounting Keys:Unmounting Keys
info filesystems_keys:post_stop_script:after umount:after umount
info filesystems_var_local:rotate_log:Rotating Logs:Rotating Logs
info userstore:run:time=161920,action=stop:time=161920,action=stop
info userstore:filesystem sync done::
info userstore:stop:found_bootup_flag:found_bootup_flag Found BOOTUP flag file
info filesystems_var_local:filesystem sync done::
info filesystems_var_local:unmount_varLocal:Unmounting VarLocal:Unmounting VarLocal
info upstart_f:jobs_stopped:elapsed_ms=6410,timeout_ms=30000:elapsed_ms=6410,timeout_ms=30000
info shutdown:mounting root filesystem read-only::
info shutdown:syncing disks::
info shutdown:end:level=6,halt=:level=6,halt=
[  168.370015] imx2-wdt 20bc000.wdog: Device shutdown: Expect reboot!
[  168.384733] reboot: Restarting system

HW

U-Boot 2016.03 (Dec 11 2018 - 23:53:19 +0000)

CPU:   Freescale i.MX6SLL rev1.1 996 MHz (running at 792 MHz)
CPU:   Commercial temperature grade (0C to 95C) at 51C
Reset cause: POR
Board: MX6SLL Rex
I2C:   ready
DRAM:  512 MiB
entering PMIC test mode
in PMIC test mode -- apply bootup workaround
switching back to PMIC user mode
setup_pmic_mode -- make sure pmic is in user mode
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
idme_initialize
Idme version is 2.x and set related function to V2.x
IDME table version 2.1
hibernation: Not from hibernation
Core : f770ee83 2018/03/16 19:49:02 (Licensed to Amazon Fulfillment Services,Inc..)
SBIOS: v2.0 2019/03/20 01:52:11
TTBR:9fffc059
Platform: v2.0 2019/03/20 01:52:11
fl
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Hardware Board: Unknown(12)
Board ID is P001F30983860B16
WFO module
secure_cpu: 1, production: 1, unlocked: 0
Boot mode is 0
Hit any key to stop autoboot:  0 
boota mmc1 
boota: trying to boot from partition: kernel
Certificate authenticated
==============
Image Metadata
==============
product:moonshine
signer:CodeSigner
Image AUTHENTICATED with PRODUCTION certificate
kernel   @ 83008000 (6660480)
ramdisk  @ 84000000 (5577728)
fdt      @ 83f00000 (93163)
## Booting Android Image at 0x80800000 ...
Kernel load addr 0x83008000 size 6505 KiB
Kernel command line: console=ttymxc0,115200 consoleblank=0 uart_at_4m root=/dev/mmcblk1p8 rootwait quiet secure_cpu=1 androidboot.secure_cpu=1 androidboot.prod=1 androidboot.unlocked_kernel=false
## Flattened Device Tree blob at 83f00000
   Booting using the fdt blob at 0x83f00000
## Traversing FDT blob at 0x83f00000 for imx6sll-moonshine-wfo.dtb at offset 0x8
Found imx6sll-moonshine-wfo.dtb at 0x83f077b0, len 0x78af
   OK to initialize idme device tree
   Loading Kernel Image ... OK
   Loading Ramdisk to 9e79a000, end 9ecebc00 ... OK
   Using Device Tree in place at 83f077b0, end 83f1205e

Starting kernel ...

[    0.000000] L2C-310: enabling full line of zeros but not enabled in Cortex-A9
[    0.208089] bd71827 0-004b: Reboot Reason: SOFTWARE_RESTART     Software Shutdown
[    0.243900] idme_init: main 5
[    0.243908] idme_init: can't read bootmode err=-22
[    0.369943] IRQ# for BT HOST WAKE: 119
[    0.614140] cpu cpu0: dev_pm_opp_get_opp_count: device OPP not found (-19)
4.1.15-lab126 #1 SMP PREEMPT Wed Mar 20 01:53:16 UTC 2019 armv7l
[    1.204500] imx_epdc_v2_fb 20f4000.epdc: ok to request xon pins 109
[    1.211377] requesting waveform imx/epdc/epdc_ED060KC4.fw
[    2.914610] imx_epdc_v2_fb 20f4000.epdc: Update region is outside bounds of framebuffer.Aborting update.
Press [ENTER] for recovery menu...       0 /BOOTING DEFAULT.
IP-Config: no devices to configure
kinit: Mounted root (ext3 filesystem) readonly.
info sytem:mounted_proc::
info system:mounted_sys::
info system:sy00::
info system:mounted_dev::
info milestone:5.83:49.1:49.1
info milestone:5.87:49.2:49.2
info milestone:5.90:49.3:49.3
info milestone:5.96:49.4:49.4
info milestone:5.99:49.5:49.5
info sytem:mounted_tmpfs::
info milestone:6.13:sy50:sy50
info system:start:time=6150:time=6150
info hardware:no_wan:: WiFi only device. No WAN found
info system:config:platform=rex,board=moonshine,rev=09,proto=Y,wifi=Y,wan=N:platform=rex,board=moonshine,rev=09,proto=Y,wifi=Y,wan=N
info milestone:6.32:sy51:sy51
lipc-send-event[353]: W def:lipc:method=LipcOpenEx service=com.lab126.hal:Method has been deprecated.
lipc-send-event[353]: E lipc:con::Connection error(Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory)
lipc-send-event[353]: C def:dbusi::Failed to init dbus
lipc-send-event[353]: E def:open::Failed to open LIPC
lipc-send-event[353]: E def:fail:source=com.lab126.hal, event=powerButtonPressed:Sending event failed
lipc-send-event[375]: W def:lipc:method=LipcOpenEx service=com.lab126.hal:Method has been deprecated.
lipc-send-event[375]: E lipc:con::Connection error(Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory)
lipc-send-event[375]: C def:dbusi::Failed to init dbus
lipc-send-event[375]: E def:open::Failed to open LIPC
lipc-send-event[375]: E def:fail:source=com.lab126.hal, event=mmcIn:Sending event failed
lipc-send-event[380]: W def:lipc:method=LipcOpenEx service=com.lab126.hal:Method has been deprecated.
lipc-send-event[380]: E lipc:con::Connection error(Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory)
lipc-send-event[380]: C def:dbusi::Failed to init dbus
lipc-send-event[380]: E def:open::Failed to open LIPC
lipc-send-event[380]: E def:fail:source=com.lab126.hal, event=usbPlugIn:Sending event failed
lipc-send-event[385]: W def:lipc:method=LipcOpenEx service=com.lab126.hal:Method has been deprecated.
lipc-send-event[385]: E lipc:con::Connection error(Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory)
lipc-send-event[385]: C def:dbusi::Failed to init dbus
lipc-send-event[385]: E def:open::Failed to open LIPC
lipc-send-event[385]: E def:fail:source=com.lab126.hal, event=usbPlugIn:Sending event failed
info milestone:7.75:sy99:sy99
info system:done:time=7780:time=7780
crond[396]: crond (busybox 1.28.3) started, log level 8

init.exe: sshd main process (395) terminated with status 127
init.exe: sshd main prinit.exe: recevent pre-start process (399) terminated with status 1

--- SORRY, LOGIN IS DISABLED ON DEVICE ---
info milestone:8.15:sc01:sc01
info system_fs_loopbacks:mountingfs:Mounting compressed directories filesystem images:Mounting compressed directories filesystem images
info milestone:8.19:sc02:sc02
info milestone:8.23:/usr/share/X11/xkb:/usr/share/X11/xkb
info system_fs_loopbacks:mounted:Image /usr/share/X11/xkb.sqsh mounted:Image /usr/share/X11/xkb.sqsh mounted
info milestone:8.29:3:3
info milestone:8.30:sc05:sc05
info milestone:8.32:/usr/java/lib/fonts:/usr/java/lib/fonts
info system_fs_loopbacks:mounted:Image /usr/java/lib/fonts.sqsh mounted:Image /usr/java/lib/fonts.sqsh mounted
info milestone:8.39:4:4
info milestone:8.39:sc05:sc05
info milestone:8.41:/etc/kdb.src:/etc/kdb.src
info system_fs_loopbacks:mounted:Image /etc/kdb.src.sqsh mounted:Image /etc/kdb.src.sqsh mounted
info milestone:8.48:5:5
info milestone:8.49:sc05:sc05
info milestone:8.50:/usr/lib/locale:/usr/lib/locale
info system_fs_loopbacks:mounted:Image /usr/lib/locale.sqsh mounted:Image /usr/lib/locale.sqsh mounted
info milestone:8.57:6:6
info milestone:8.58:sc05:sc05
info milestone:8.59:/usr/share/keyboard:/usr/share/keyboard
info system_fs_loopbacks:mounted:Image /usr/share/keyboard.sqsh mounted:Image /usr/share/keyboard.sqsh mounted
info milestone:8.77:7:7
info milestone:8.78:sc05:sc05
info milestone:8.79:/opt/var/local:/opt/var/local
info system_fs_loopbacks:mounted:Image /opt/var/local.sqsh mounted:Image /opt/var/local.sqsh mounted
info milestone:8.86:8:8
info milestone:8.86:sc05:sc05
info milestone:8.87:sc07:sc07
info system:emiting_event:mounted_fs_loopbacks:mounted_fs_loopbacks
debug sytem:event_emitted:mounted_fs_loopbacks:mounted_fs_loopbacks
info system:emiting_event:loaded_modules_dependencies:loaded_modules_dependencies
info milestone:8.93:fs75:fs75
debug sytem:event_emitted:loaded_modules_dependencies:loaded_modules_dependencies
info system:emiting_event:loaded_fuse:loaded_fuse
debug sytem:event_emitted:loaded_fuse:loaded_fuse
info modules:modprobe:loading module falcon:loading module falcon
info milestone:9.02:fs00:fs00
info system:emiting_event:loaded_falcon:loaded_falcon
debug sytem:event_emitted:loaded_falcon:loaded_falcon
info hardware:no_wan:: WiFi only device. No WAN found
info system:emiting_event:loaded_cdc_ncm:loaded_cdc_ncm
info filesystems_keys:mouting_keys:mounting keys partition:mounting keys partition
debug sytem:event_emitted:loaded_cdc_ncm:loaded_cdc_ncm
info system:emiting_event:loaded_fakekey:loaded_fakekey
info system:emiting_event:mounted_keys:mounted_keys
debug sytem:event_emitted:loaded_fakekey:loaded_fakekey
debug sytem:event_emitted:mounted_keys:mounted_keys
info milestone:9.21:fs40:fs40
info filesystems_var_local:DB PARAMS:FreePageSize:36864 bytes. AvailableSpaceInVarLocal:924756 KB.:FreePageSize:36864 bytes. AvailableSpaceInVarLocal:924756 KB.
info milestone:9.61:fs23:fs23
info system:emiting_event:mounted_varLocal:mounted_varLocal
debug sytem:event_emitted:mounted_varLocal:mounted_varLocal
info milestone:9.68:fs25:fs25
info milestone:9.74:vi00:vi00
info milestone:9.83:vi99:vi99
info touch:detect:enable touch regulators:enable touch regulators
info display:started:time=9930:time=9930
info system:emiting_event:display_ready:display_ready
debug sytem:event_emitted:display_ready:display_ready
info prereg:PRAGMA_QUICK_CHECK_PASSED:: sts=0
info userstore:run:time=10160,action=start:time=10160,action=start
info userstore:start:found_shutdown_flag:found_shutdown_flag Found SHUTDOWN flag file
info touch:detect:detect touch devices:detect touch devices
info touch:detect:disable touch regulators:disable touch regulators
info touch:detect:install Goodix touch driver:install Goodix touch driver
info modules:modprobe:loading module gt9xx_ts:loading module gt9xx_ts
info system:emiting_event:loaded_gt9xx_ts:loaded_gt9xx_ts
debug sytem:event_emitted:loaded_gt9xx_ts:loaded_gt9xx_ts
info system:emiting_event:loaded_touch:loaded_touch
debug sytem:event_emitted:loaded_touch:loaded_touch
info system:emiting_event:mounted_userstore:mounted_userstore
debug sytem:event_emitted:mounted_userstore:mounted_userstore
info milestone:11.98:fs50:fs50
info milestone:12.09:fs90:fs90
info milestone:12.17:fs99:fs99
info battery:charged:cap=,mV=,mAH=:cap=,mV=,mAH=
info system:emiting_event:battery_ready:battery_ready
debug sytem:event_emitted:battery_ready:battery_ready
info milestone:12.34:sys99:sys99
info system_setup:system_setup_after_shpm done::
info system:emiting_event:dbus_ready:dbus_ready
debug sytem:event_emitted:dbus_ready:dbus_ready
info dbus:check-update:status=2:status=2 dbus_ready sent
info demd:starting...::
info hardware:no_wan:: WiFi only device. No WAN found
info milestone:13.95:dy01:dy01
info milestone:14.17:pm25:pm25
info milestone:14.66:dy02:dy02
info milestone:14.69:dy03:dy03
info milestone:15.42:xx00:xx00
info X:load:time=15560:time=15560
info X:xorg.conf:Generating xorg.conf:Generating xorg.conf
info stopVoiceView:entered:arg=deleteAsrFlags:arg=deleteAsrFlags
info stopVoiceView:Deleting ASR Flags::
info X:xorg.conf:xorg.conf generated:xorg.conf generated
info milestone:18.25:xx50:xx50
info X:starting:time=18360:time=18360
info milestone:24.23:xx99:xx99
info X:started:time=24280:time=24280
info system:emiting_event:x_setup_ready:x_setup_ready
debug sytem:event_emitted:x_setup_ready:x_setup_ready
info asr_setup:Not in asr mode::reason=flag file not present. shutting down asr_setup::
info locale:read:lang=zh_CN.utf8,lc_all=zh_CN.utf8:lang=zh_CN.utf8,lc_all=zh_CN.utf8 Retrieved Language
info system:emiting_event:langpicker_ready:langpicker_ready LANG_PICKER_SCREEN_SHOWN=0
debug sytem:event_emitted:langpicker_ready:langpicker_ready LANG_PICKER_SCREEN_SHOWN=0
info blanket_f:module already loaded:splash:splash
info system:emiting_event:start_splash:start_splash
debug sytem:event_emitted:start_splash:start_splash
info asr_bt_reboot:asr_bt_reboot begin on started winmgr_ready::
info milestone:26.83:pi00:pi00
info milestone:27.18:pi99:pi99
info system:emiting_event:contentpack_font_ready:contentpack_font_ready
debug sytem:event_emitted:contentpack_font_ready:contentpack_font_ready
info milestone:37.50:fr00:fr00
info milestone:37.68:fr50:fr50
info milestone:37.74:fr51:fr51
info framework:starting:time=39320:time=39320
info framework:commandLine:HEAP = -minimal -Xmx31m -Xms31m -XX:MaxNewSize=4m -XX:SurvivorRatio=3 -XX:TargetSurvivorRatio=80 -Xss100k -XX:ReservedCodeCacheSize=3m -XX:+InitialGenPreTouch -XX:CompileThreshold=5000 -XX:CodeCacheMinimumFreeSpace=100k -XX:NmethodSweepFraction=6 -XX:NmethodSweepActivity=2 -XX:NmethodSweepMaxWaitTime=8 -XX:NmethodHotnessCounterResetValue=64 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=15 -XX:+UseAggressiveHeapShrink -XX:MaxInlineSize=16 -XX:MaxInlineLevel=2 -XX:-InlineSynchronizedMethods:HEAP = -minimal -Xmx31m -Xms31m -XX:MaxNewSize=4m -XX:SurvivorRatio=3 -XX:TargetSurvivorRatio=80 -Xss100k -XX:ReservedCodeCacheSize=3m -XX:+InitialGenPreTouch -XX:CompileThreshold=5000 -XX:CodeCacheMinimumFreeSpace=100k -XX:NmethodSweepFraction=6 -XX:NmethodSweepActivity=2 -XX:NmethodSweepMaxWaitTime=8 -XX:NmethodHotnessCounterResetValue=64 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=15 -XX:+UseAggressiveHeapShrink -XX:MaxInlineSize=16 -XX:MaxInlineLevel=2 -XX:-InlineSynchronizedMethods
info hardware:no_wan:: WiFi only device. No WAN found
info framework:##### Starting Java SE8 VM ::
info milestone:75.85:fr99:fr99
info framework:started:time=76000,delta=38310:time=76000,delta=38310
info blanket_f:loading blanket module:usb:usb
info blanket_f:unloading blanket module:splash:splash
info system:emiting_event:framework_ready:framework_ready
debug sytem:event_emitted:framework_ready:framework_ready
info stored:started::
info clickstreamHeartbeatMetricsFramework:Skipping metrics recording, as it is the same day::
info stored:read_in_counters:REBOOTS=0, REBOOT_LIMIT=1, RESTARTS=0, RESTART_LIMIT=5:REBOOTS=0, REBOOT_LIMIT=1, RESTARTS=0, RESTART_LIMIT=5
info monitor:writing_file:file=/var/run/upstart/stored.restarts:file=/var/run/upstart/stored.restarts
Retrieved 376 keys for system/daemon/pmond/

[knc1]

By the time you see the "Press any key" message, it is already too late to press anything.
It helps if your keyboard has an "Any" key.

Reboot Kindle
When the first character appears on the serial line, press and hold the Any key (space bar will do).
Keep it pressed until the Kindle recognizes that a key is pressed.

[5231251]

Originally Posted by knc1

By the time you see the "Press any key" message, it is already too late to press anything.
It helps if your keyboard has an "Any" key.

Reboot Kindle
When the first character appears on the serial line, press and hold the Any key (space bar will do).
Keep it pressed until the Kindle recognizes that a key is pressed.

First of All，Thank for your answer，but it did not work also

[knc1]

Originally Posted by 5231251

First of All，Thank for your answer，but it did not work also

Sorry, I am out of ideas.
Anyone else have a suggestion?