[Moto G Q&A, Help & Troubleshooting] adhinos:
C:\502>mfastboot.exe flash partition gpt.bin
< waiting for device >
target max-sparse-size: 256MB
sending 'partition' (32 KB)...
OKAY [ 0.031s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.312s

C:\502>mfastboot.exe flash motoboot motoboot.img
target max-sparse-size: 256MB
sending 'motoboot' (1953 KB)...
OKAY [ 0.109s]
writing 'motoboot'...
(bootloader) Motoboot: Preflash validation for tz
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.374s

C:\502>mfastboot.exe flash logo logo.bin
target max-sparse-size: 256MB
sending 'logo' (295 KB)...
OKAY [ 0.078s]
writing 'logo'...
OKAY [ 0.078s]
finished. total time: 0.172s

C:\502>mfastboot.exe flash boot boot.img
target max-sparse-size: 256MB
sending 'boot' (10240 KB)...
OKAY [ 0.374s]
writing 'boot'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.437s

C:\502>mfastboot.exe flash recovery recovery.img
target max-sparse-size: 256MB
sending 'recovery' (10240 KB)...
OKAY [ 0.406s]
writing 'recovery'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.452s

C:\502>mfastboot.exe flash system system.img_sparsechunk.0
target max-sparse-size: 256MB
sending 'system' (257883 KB)...
OKAY [ 8.112s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.268s

C:\502>mfastboot.exe flash system system.img_sparsechunk.1
target max-sparse-size: 256MB
sending 'system' (256782 KB)...
OKAY [ 8.081s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.159s

C:\502>mfastboot.exe flash system system.img_sparsechunk.2
target max-sparse-size: 256MB
sending 'system' (260098 KB)...
OKAY [ 8.174s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.252s

C:\502>mfastboot.exe flash system system.img_sparsechunk.3
target max-sparse-size: 256MB
sending 'system' (160376 KB)...
OKAY [ 5.070s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 5.132s

C:\502>mfastboot.exe flash modem NON-HLOS.bin
target max-sparse-size: 256MB
sending 'modem' (49356 KB)...
OKAY [ 1.607s]
writing 'modem'...
OKAY [ 2.402s]
finished. total time: 4.025s

C:\502>mfastboot.exe erase modemst1
erasing 'modemst1'...
OKAY [ 0.031s]
finished. total time: 0.031s

C:\502>mfastboot.exe erase modemst2
erasing 'modemst2'...
OKAY [ 0.078s]
finished. total time: 0.078s

C:\502>mfastboot.exe flash fsg fsg.mbn
target max-sparse-size: 256MB
sending 'fsg' (102 KB)...
OKAY [ 0.094s]
writing 'fsg'...
OKAY [ 5.288s]
finished. total time: 5.398s

C:\502>mfastboot.exe erase cache
erasing 'cache'...
OKAY [ 0.062s]
finished. total time: 0.062s

C:\502>mfastboot.exe erase userdata
erasing 'userdata'...
OKAY [ 0.515s]
finished. total time: 0.515s

C:\502>mfastboot.exe oem fb_mode_clear
...
OKAY [ 0.000s]
finished. total time: 0.000s

C:\502>mfastboot.exe reboot-bootloader
rebooting into bootloader...
OKAY [ 0.031s]
finished. total time: 0.031s

5.0.2 lollipop firmware not work:confused: