[Moto G Q&A, Help & Troubleshooting] wel51:
Trying to flash my Nexus 6 back to Lollipop fm M, but getting problems. I'm posting the output from all three steps below. Any help is greatly appreciated.

+++++++++++++++++++++++ Try flash-all; fails on bootloader issue ++++++++++++++++++++++++++++++

C:\Users\winlee\Desktop\adb-tools\shamu-lrx21o>flash-all

target reported max download size of 536870912 bytes

sending 'bootloader' (3807 KB)...

OKAY [ 0.128s]

writing 'bootloader'...

(bootloader) Motoboot: Preflash validation for aboot

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 0.320s

rebooting into bootloader...

OKAY [ 0.002s]

finished. total time: 0.002s

target reported max download size of 536870912 bytes

sending 'radio' (67170 KB)...

OKAY [ 2.260s]

writing 'radio'...

(bootloader) flashing modem ...

(bootloader) flashing mdm1m9kefs1 ...

(bootloader) flashing mdm1m9kefs2 ...

(bootloader) flashing mdm1m9kefs3 ...

(bootloader) flashing versions ...

OKAY [ 0.941s]

finished. total time: 3.202s

rebooting into bootloader...

OKAY [ 0.002s]

finished. total time: 0.003s

target reported max download size of 536870912 bytes

archive does not contain 'boot.sig'

archive does not contain 'recovery.sig'

archive does not contain 'system.sig'

archive does not contain 'vendor.img'

Creating filesystem with parameters:

Size: 28474998784

Block size: 4096

Blocks per group: 32768

Inodes per group: 8160

Inode size: 256

Journal blocks: 32768

Label:

Blocks: 6951904

Block groups: 213

Reserved block group size: 1024

Created filesystem with 11/1738080 inodes and 153124/6951904 blocks

Creating filesystem with parameters:

Size: 268435456

Block size: 4096

Blocks per group: 32768

Inodes per group: 8192

Inode size: 256

Journal blocks: 1024

Label:

Blocks: 65536

Block groups: 2

Reserved block group size: 15

Created filesystem with 11/16384 inodes and 2089/65536 blocks

--------------------------------------------

Bootloader Version...: moto-apq8084-71.15

Baseband Version.....: D4.0-9625-02.55.03a

Serial Number........: ZX1G22MHRK

--------------------------------------------

checking product...

OKAY [ 0.002s]

checking version-bootloader...

FAILED

Device version-bootloader is 'moto-apq8084-71.15'.

Update requires 'moto-apq8084-71.05'.

finished. total time: 0.116s

Press any key to exit...

++++++++++++++++++++++++ Try to flash bootloader, also fails +++++++++++++++++++++++++++++++++

C:\Users\winlee\Desktop\adb-tools\shamu-lrx21o>fastboot flash bootloader bootloader-shamu-moto-apq8084-71.05.img

target reported max download size of 536870912 bytes

sending 'bootloader' (3807 KB)...

OKAY [ 0.134s]

writing 'bootloader'...

(bootloader) Motoboot: Preflash validation for aboot

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 0.334s

++++++++++++++++++++++++ Env vars show bootloader unlocked +++++++++++++++++++++++++++++++++

C:\Users\winlee>fastboot getvar all

(bootloader) version: 0.5

(bootloader) version-bootloader: moto-apq8084-71.15

(bootloader) product: shamu

(bootloader) board: shamu

(bootloader) secure: yes

(bootloader) hwrev: 0x83A0

(bootloader) radio: 0x6

(bootloader) emmc: 32GB Samsung REV=07 PRV=0B TYPE=57

(bootloader) ram: 3072MB Samsung S8 SDRAM DIE=6Gb

(bootloader) cpu: APQ8084 ES1.1

(bootloader) serialno: ZX1G22MHRK

(bootloader) cid: 0x00DE

(bootloader) channelid: 0x00

(bootloader) uid: 76E5530111000000000000000000

(bootloader) unlocked: yes

(bootloader) securestate: unlocked

(bootloader) iswarrantyvoid: yes

(bootloader) mot_sst: 3

(bootloader) max-download-size: 536870912

(bootloader) reason: Reboot mode set to fastboot

(bootloader) imei: 355499060714529

(bootloader) meid:

(bootloader) date: 03-15-2015

(bootloader) sku: XT1103

(bootloader) iccid:

(bootloader) cust_md5:

(bootloader) max-sparse-size: 268435456

(bootloader) current-time: "Thu Jan 15 3: 6:37 UTC 2015"

(bootloader) ro.build.fingerprint: none

(bootloader) ro.build.version.full: none

(bootloader) ro.build.version.qcom: none

(bootloader) version-baseband: D4.0-9625-02.55.03a

(bootloader) kernel.version: none

(bootloader) sdi.git: git=MBM-NG-V71.15-0-gf291c61

(bootloader) sbl1.git: git=MBM-NG-V71.15-0-g60ea7e6

(bootloader) rpm.git: git=MBM-NG-V71.15-0-g18b261e

(bootloader) tz.git: git=MBM-NG-V71.15-0-ge5920ce

(bootloader) aboot.git: git=MBM-NG-V71.15-0-g96f7faf

(bootloader) partition-type:modem: raw

(bootloader) partition-type:metadata: raw

(bootloader) partition-type:sbl1: raw

(bootloader) partition-type:sdi: raw

(bootloader) partition-type:sec: raw

(bootloader) partition-type:ddr: raw

(bootloader) partition-type:aboot: raw

(bootloader) partition-type:rpm: raw

(bootloader) partition-type:utags: raw

(bootloader) partition-type:tz: raw

(bootloader) partition-type:padA: raw

(bootloader) partition-type:sbl1bak: raw

(bootloader) partition-type:abootBackup: raw

(bootloader) partition-type:rpmBackup: raw

(bootloader) partition-type:utagsBackup: raw

(bootloader) partition-type:tzBackup: raw

(bootloader) partition-type:versions: raw

(bootloader) partition-type:frp: raw

(bootloader) partition-type:mdm1m9kefs1: raw

(bootloader) partition-type:mdm1m9kefs2: raw

(bootloader) partition-type:mdm1m9kefs3: raw

(bootloader) partition-type:padB: raw

(bootloader) partition-type:sp: raw

(bootloader) partition-type:keystore: raw

(bootloader) partition-type:logs: raw

(bootloader) partition-type:persist: raw

(bootloader) partition-type:mdm1hob: raw

(bootloader) partition-type:mdm1dhob: raw

(bootloader) partition-type:cid: raw

(bootloader) partition-type:logo: raw

(bootloader) partition-type:misc: raw

(bootloader) partition-type:padD: raw

(bootloader) partition-type:mdm1m9kefsc: raw

(bootloader) partition-type:ssd: raw

(bootloader) partition-type:recovery: raw

(bootloader) partition-type:kpan: raw

(bootloader) partition-type:boot: raw

(bootloader) partition-type:cache: ext4

(bootloader) partition-type:oem: raw

(bootloader) partition-type:padC: raw

(bootloader) partition-type:system: raw

(bootloader) partition-type:userdata: ext4

(bootloader) partition-size:modem: 0x0000000007000000

(bootloader) partition-size:metadata: 0x0000000001000000

(bootloader) partition-size:sbl1: 0x0000000000060000

(bootloader) partition-size:sdi: 0x000000000000e000

(bootloader) partition-size:sec: 0x0000000000004000

(bootloader) partition-size:ddr: 0x0000000000008000

(bootloader) partition-size:aboot: 0x0000000000100000

(bootloader) partition-size:rpm: 0x0000000000040000

(bootloader) partition-size:utags: 0x0000000000080000

(bootloader) partition-size:tz: 0x000000000007d000

(bootloader) partition-size:padA: 0x000000000040f000

(bootloader) partition-size:sbl1bak: 0x0000000000060000

(bootloader) partition-size:abootBackup: 0x0000000000100000

(bootloader) partition-size:rpmBackup: 0x0000000000040000

(bootloader) partition-size:utagsBackup: 0x0000000000080000

(bootloader) partition-size:tzBackup: 0x000000000007d000

(bootloader) partition-size:versions: 0x0000000000001000

(bootloader) partition-size:frp: 0x0000000000080000

(bootloader) partition-size:mdm1m9kefs1: 0x0000000000100000

(bootloader) partition-size:mdm1m9kefs2: 0x0000000000100000

(bootloader) partition-size:mdm1m9kefs3: 0x0000000000100000

(bootloader) partition-size:padB: 0x0000000000100000

(bootloader) partition-size:sp: 0x0000000001000000

(bootloader) partition-size:keystore: 0x0000000001000000

(bootloader) partition-size:logs: 0x0000000000200000

(bootloader) partition-size:persist: 0x0000000002000000

(bootloader) partition-size:mdm1hob: 0x0000000000040000

(bootloader) partition-size:mdm1dhob: 0x0000000000008000

(bootloader) partition-size:cid: 0x0000000000020000

(bootloader) partition-size:logo: 0x0000000000800000

(bootloader) partition-size:misc: 0x0000000000100000

(bootloader) partition-size:padD: 0x0000000000278000

(bootloader) partition-size:mdm1m9kefsc: 0x0000000000000400

(bootloader) partition-size:ssd: 0x0000000000002000

(bootloader) partition-size:recovery: 0x0000000001004000

(bootloader) partition-size:kpan: 0x00000000008e0000

(bootloader) partition-size:boot: 0x0000000001000000

(bootloader) partition-size:cache: 0x0000000010000000

(bootloader) partition-size:oem: 0x0000000004000000

(bootloader) partition-size:padC: 0x0000000000100000

(bootloader) partition-size:system: 0x0000000080000000

(bootloader) partition-size:userdata: 0x00000006a13e0000

(bootloader) qe:

(bootloader) ro.carrier: unknown

(bootloader) dm-verity-state: Not Supported

all: listed above

finished. total time: 1.394s

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++