Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1)Try to AU from 9592.15.0 => M61 9633.0.0 Caroline 
(2)
(3)

log info.
FROM (rootfs):
CHROMEOS_ARC_ANDROID_SDK_VERSION=25
CHROMEOS_ARC_VERSION=4078577
CHROMEOS_AUSERVER=https://tools.google.com/service/update2
CHROMEOS_BOARD_APPID={C166AF52-7EE9-4F08-AAA7-B4B895A9F336}
CHROMEOS_CANARY_APPID={90F229CE-83E2-4FAF-8479-E368A34938B1}
CHROMEOS_DEVSERVER=
CHROMEOS_RELEASE_APPID={C166AF52-7EE9-4F08-AAA7-B4B895A9F336}
CHROMEOS_RELEASE_BOARD=caroline-signed-mpkeys
CHROMEOS_RELEASE_BRANCH_NUMBER=15
CHROMEOS_RELEASE_BUILDER_PATH=caroline-release/R60-9592.15.0
CHROMEOS_RELEASE_BUILD_NUMBER=9592
CHROMEOS_RELEASE_BUILD_TYPE=Official Build
CHROMEOS_RELEASE_CHROME_MILESTONE=60
CHROMEOS_RELEASE_DESCRIPTION=9592.15.0 (Official Build) dev-channel caroline 
CHROMEOS_RELEASE_NAME=Chrome OS
CHROMEOS_RELEASE_PATCH_NUMBER=0
CHROMEOS_RELEASE_TRACK=dev-channel
CHROMEOS_RELEASE_VERSION=9592.15.0
DEVICETYPE=CHROMEBOOK
GOOGLE_RELEASE=9592.15.0

FROM (stateful):
CHROMEOS_IS_POWERWASH_ALLOWED=false
CHROMEOS_RELEASE_TRACK=dev-channel

TO:
CHROMEOS_ARC_ANDROID_SDK_VERSION=25
CHROMEOS_ARC_VERSION=4082827
CHROMEOS_AUSERVER=https://tools.google.com/service/update2
CHROMEOS_BOARD_APPID={C166AF52-7EE9-4F08-AAA7-B4B895A9F336}
CHROMEOS_CANARY_APPID={90F229CE-83E2-4FAF-8479-E368A34938B1}
CHROMEOS_DEVSERVER=
CHROMEOS_RELEASE_APPID={C166AF52-7EE9-4F08-AAA7-B4B895A9F336}
CHROMEOS_RELEASE_BOARD=caroline-signed-mpkeys
CHROMEOS_RELEASE_BRANCH_NUMBER=0
CHROMEOS_RELEASE_BUILDER_PATH=caroline-release/R61-9633.0.0
CHROMEOS_RELEASE_BUILD_NUMBER=9633
CHROMEOS_RELEASE_BUILD_TYPE=Official Build
CHROMEOS_RELEASE_CHROME_MILESTONE=61
CHROMEOS_RELEASE_DESCRIPTION=9633.0.0 (Official Build) dev-channel caroline 
CHROMEOS_RELEASE_NAME=Chrome OS
CHROMEOS_RELEASE_PATCH_NUMBER=0
CHROMEOS_RELEASE_TRACK=dev-channel
CHROMEOS_RELEASE_VERSION=9633.0.0
DEVICETYPE=CHROMEBOOK
GOOGLE_RELEASE=9633.0.0

ChromeosChrootPostinst(9592.15.0)
Set boot target to /dev/mmcblk0p5: Partition 5, Slot B
SetImage
KERNEL_CONFIG: console= loglevel=7 init=/sbin/init cros_secure oops=panic panic=-1 root=/dev/dm-0 rootwait ro dm_verity.error_behavior=3 dm_verity.max_bios=-1 dm_verity.dev_wait=1 dm="1 vroot none ro 1,0 3584000 verity payload=PARTUUID=%U/PARTNROFF=1 hashtree=PARTUUID=%U/PARTNROFF=1 hashstart=3584000 alg=sha1 root_hexdigest=df555d2fd2b71495656ab80fe2abcf0b565b003e salt=3e006489abab6286855aae99ed23d63271474f84eeb3fff428525943e74f8270" noinitrd vt.global_cursor_default=0 kern_guid=%U add_efi_memmap boot=local noresume noswap i915.modeset=1 tpm_tis.force=1 tpm_tis.interrupts=0 nmi_watchdog=panic,lapic intel_idle.max_cstate=7  
Setting up verity.
Finished after 17 seconds.
Clearing network driver boot cache: /var/lib/preload-network-drivers.
Syncing filesystems before changing boot order...
Finished after 0 seconds.
Updating Partition Table Attributes using CgptManager...
Updated kernel 4 with Successful = 0 and NumTriesLeft = 6
Checking /mnt/stateful_partition/unencrypted permission.
Permission is ok.
Unlinked file /var/lib/ureadahead/opt.google.containers.android.rootfs.root.pack
Unlinked file /var/lib/ureadahead/pack
Starting firmware updater (/tmp/.org.chromium.Chromium.M88BRM/usr/sbin/chromeos-firmwareupdate --mode=autoupdate)
Command: /tmp/.org.chromium.Chromium.M88BRM/usr/sbin/chromeos-firmwareupdate --mode=autoupdate
Starting Google_Caroline firmware updater v4 (autoupdate)...
 - Updater package: [Google_Caroline.7820.300.0 / EC:caroline_v1.9.375-8829f10 / PD:caroline_pd_v1.9.375-8829f10]
 - Current system:  [RO:Google_Caroline.7820.263.0 , ACT:Google_Caroline.7820.300.0 / EC:caroline_v1.9.375-8829f10 / PD:caroline_pd_v1.9.375-8829f10]
 - Write protection: Hardware: off, Software: Main=off
Read the current FLMSTR values...
flashrom v0.9.9  : b6e26e6 : Jun 05 2017 00:36:37 UTC on Linux 3.18.0-14852-gd99af821993c (x86_64)
flashrom v0.9.9  : b6e26e6 : Jun 05 2017 00:36:37 UTC on Linux 3.18.0-14852-gd99af821993c (x86_64)
Calibrating delay loop... OK.
coreboot table found at 0x7ab80000.
WARNING: SPI Configuration Lockdown activated.
Reading flash... SUCCESS
No need to modify image file.
autoupdate(recovery): update RO+RW
 * invoke: flashrom -p host --fast-verify -w bios.bin
 Execution failed (255): flashrom -p host --fast-verify -w bios.bin
 Messages:
Calibrating delay loop... OK.
coreboot table found at 0x7ab80000.
Erasing and writing flash chip... Verifying flash... FAILED
flashrom v0.9.9  : b6e26e6 : Jun 05 2017 00:36:37 UTC on Linux 3.18.0-14852-gd99af821993c (x86_64)
flashrom v0.9.9  : b6e26e6 : Jun 05 2017 00:36:37 UTC on Linux 3.18.0-14852-gd99af821993c (x86_64)
WARNING: SPI Configuration Lockdown activated.
VERIFY FAILED at 0x000001f5! Expected=0x84, Read=0x82, failed byte count from 0x00000000-0x00ffffff: 0x1
Your flash chip is in an unknown state.
Get help on IRC at irc.freenode.net (channel #flashrom) or
mail flashrom@flashrom.org with FAILED: your board name in the subject line!
-------------------------------------------------------------------------------
DO NOT REBOOT OR POWEROFF!
ERROR: Execution FAILED.
ERROR: Execution failed: ./updater4.sh (error code = 1)
Finished after 44 seconds.
Failed Command: /tmp/.org.chromium.Chromium.M88BRM/usr/sbin/chromeos-firmwareupdate --mode=autoupdate - Exit Code 1
Firmware update failed (error code: 1).
Rolling back update due to failure installing required firmware.
Successfully updated GPT with all settings to rollback.
PostInstall Failed

[0609/164216:ERROR:postinstall_runner_action.cc(291)] Postinst command failed with code: 1
[0609/164216:ERROR:postinstall_runner_action.cc(328)] Postinstall action failed.
[0609/164216:INFO:action_processor.cc(116)] ActionProcessor: finished PostinstallRunnerAction with code ErrorCode::kPostinstallRunnerError
[0609/164216:INFO:action_processor.cc(121)] ActionProcessor: Aborting processing due to failure.
[0609/164216:INFO:update_attempter.cc(901)] Processing Done.
[0609/164216:INFO:cpu_limiter.cc(71)] Setting cgroup cpu shares to  1024
[0609/164216:INFO:cpu_limiter.cc(79)] CPU shares = 1024
[0609/164216:ERROR:update_attempter.cc(1336)] Update failed.