[Nexus 6 Q&A, Help & Troubleshooting] alex482:
C:\Program Files (x86)\platform-tools>adb devices

List of devices attached

ZX1G423BMR device

C:\Program Files (x86)\platform-tools>adb reboot bootloader

C:\Program Files (x86)\platform-tools>fastboot devices

ZX1G423BMR fastboot

C:\Program Files (x86)\platform-tools>fastboot erase boot

erasing 'boot'...

OKAY [ 0.000s]

finished. total time: 0.000s

C:\Program Files (x86)\platform-tools>fastboot erase cache

******** Did you mean to fastboot format this partition?

erasing 'cache'...

OKAY [ 0.048s]

finished. total time: 0.048s

C:\Program Files (x86)\platform-tools>fastboot erase recovery

erasing 'recovery'...

OKAY [ 0.014s]

finished. total time: 0.016s

C:\Program Files (x86)\platform-tools>fastboot erase system

erasing 'system'...

OKAY [ 0.617s]

finished. total time: 0.617s

C:\Program Files (x86)\platform-tools> fastboot flash bootloader bootloader-shamu-moto-apq8084-71.15.img

target reported max download size of 536870912 bytes

sending 'bootloader' (10387 KB)...

OKAY [ 0.409s]

writing 'bootloader'...

(bootloader) flashing partition ...

(bootloader) This may take a few seconds if a

(bootloader) different partition table is being

(bootloader) flashed since we need to backup

(bootloader) and restore a few partitions

(bootloader) Flashing primary GPT image...

(bootloader) Flashing backup GPT image...

(bootloader) flashing aboot ...

(bootloader) flashing sbl1 ...

(bootloader) flashing rpm ...

(bootloader) flashing tz ...

(bootloader) flashing sdi ...

(bootloader) flashing logo ...

OKAY [ 0.685s]

finished. total time: 1.102s

C:\Program Files (x86)\platform-tools>fastboot reboot-bootloader

rebooting into bootloader...

OKAY [ 0.004s]

finished. total time: 0.004s

C:\Program Files (x86)\platform-tools>fastboot flash radio radio-shamu-d4.01-9625-05.27+fsg-9625-02.104.img

target reported max download size of 536870912 bytes

sending 'radio' (115487 KB)...

OKAY [ 4.283s]

writing 'radio'...

(bootloader) flashing modem ...

(bootloader) flashing mdm1m9kefs1 ...

(bootloader) flashing mdm1m9kefs2 ...

(bootloader) flashing mdm1m9kefs3 ...

(bootloader) flashing versions ...

OKAY [ 1.522s]

finished. total time: 5.808s

C:\Program Files (x86)\platform-tools>fastboot reboot bootloader

rebooting into bootloader...

OKAY [ -0.000s]

finished. total time: -0.000s

C:\Program Files (x86)\platform-tools>fastboot flash system system.img

target reported max download size of 536870912 bytes

sending sparse 'system' (517178 KB)...

OKAY [ 20.071s]

writing 'system'...

OKAY [ 6.964s]

sending sparse 'system' (515137 KB)...

OKAY [ 20.267s]

writing 'system'...

OKAY [ 7.088s]

sending sparse 'system' (518219 KB)...

OKAY [ 20.493s]

writing 'system'...

OKAY [ 7.188s]

sending sparse 'system' (492726 KB)...

OKAY [ 19.042s]

writing 'system'...

OKAY [ 6.804s]

finished. total time: 107.938s

C:\Program Files (x86)\platform-tools>fastboot flash boot boot.img

target reported max download size of 536870912 bytes

sending 'boot' (8197 KB)...

OKAY [ 0.316s]

writing 'boot'...

OKAY [ 0.116s]

finished. total time: 0.431s

C:\Program Files (x86)\platform-tools>fastboot flash recovery recovery.img

target reported max download size of 536870912 bytes

sending 'recovery' (8915 KB)...

OKAY [ 0.334s]

writing 'recovery'...

OKAY [ 0.126s]

finished. total time: 0.463s

C:\Program Files (x86)\platform-tools>fasboot flash cache cache.img

"fasboot" no se reconoce como un comando interno o externo,

programa o archivo por lotes ejecutable.

C:\Program Files (x86)\platform-tools>fastboot flash cache cache.img

target reported max download size of 536870912 bytes

erasing 'cache'...

OKAY [ 0.057s]

sending 'cache' (6248 KB)...

OKAY [ 0.237s]

writing 'cache'...

OKAY [ 0.137s]

finished. total time: 0.446s

C:\Program Files (x86)\platform-tools>fastboot erase userdata

******** Did you mean to fastboot format this partition?

erasing 'userdata'...

OKAY [ 1.349s]

finished. total time: 1.349s

C:\Program Files (x86)\platform-tools>fastboot flash userdata userdata.img

target reported max download size of 536870912 bytes

erasing 'userdata'...

OKAY [ 1.165s]

sending 'userdata' (138868 KB)...

OKAY [ 5.070s]

writing 'userdata'...

OKAY [ 3.001s]

finished. total time: 9.236s

C:\Program Files (x86)\platform-tools>fastboot oem lock

...

(bootloader) Please flash valid signed images firstly!

FAILED (remote failure)

finished. total time: 0.070s

C:\Program Files (x86)\platform-tools>fastboot reboot

rebooting...

finished. total time: -0.000s