[Moto G Q&A, Help & Troubleshooting] :
Battery status is green. Yes, flash bat works, but it cant flash some files, like gpt, system and many others. It says (FAILED) preflash validation failed. So, my phone wont turn on.

This is the log.

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash partition gpt.bin
target max-sparse-size: 256MB
sending 'partition' (32 KB)...
OKAY [ 0.033s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.337s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash motoboot motoboot.img
target max-sparse-size: 256MB
sending 'motoboot' (1953 KB)...
OKAY [ 0.111s]
writing 'motoboot'...
(bootloader) flashing tz ...
(bootloader) flashing rpm ...
(bootloader) flashing sdi ...
(bootloader) flashing aboot ...
(bootloader) flashing sbl1 ...
OKAY [ 1.095s]
finished. total time: 1.210s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe reboot-bootloader
rebooting into bootloader...
OKAY [ 0.004s]
finished. total time: 0.005s

C:\Users\PC\Desktop\MOTO G\motog1>pause
Premere un tasto per continuare . . .

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash partition gpt.bin
target max-sparse-size: 256MB
sending 'partition' (32 KB)...
OKAY [ 0.029s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.314s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash motoboot motoboot.img
target max-sparse-size: 256MB
sending 'motoboot' (1953 KB)...
OKAY [ 0.108s]
writing 'motoboot'...
(bootloader) flashing tz ...
(bootloader) flashing rpm ...
(bootloader) flashing sdi ...
(bootloader) flashing aboot ...
(bootloader) flashing sbl1 ...
OKAY [ 1.047s]
finished. total time: 1.160s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash logo logo.bin
target max-sparse-size: 256MB
sending 'logo' (295 KB)...
OKAY [ 0.068s]
writing 'logo'...
OKAY [ 0.078s]
finished. total time: 0.150s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash boot boot.img
target max-sparse-size: 256MB
sending 'boot' (10240 KB)...
OKAY [ 0.391s]
writing 'boot'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.418s

C:\Users\PC\Desktop\MOTO G\motog1>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: 0.481s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash system system.img_sparsechunk.0
target max-sparse-size: 256MB
sending 'system' (257451 KB)...
OKAY [ 8.345s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.496s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash system system.img_sparsechunk.1
target max-sparse-size: 256MB
sending 'system' (257657 KB)...
OKAY [ 8.328s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.394s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash system system.img_sparsechunk.2
target max-sparse-size: 256MB
sending 'system' (261628 KB)...
OKAY [ 8.471s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.545s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash system system.img_sparsechunk.3
target max-sparse-size: 256MB
sending 'system' (189917 KB)...
OKAY [ 6.155s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 6.242s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash modem NON-HLOS.bin
target max-sparse-size: 256MB
sending 'modem' (60228 KB)...
OKAY [ 1.992s]
writing 'modem'...
OKAY [ 1.562s]
finished. total time: 3.558s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe erase modemst1
erasing 'modemst1'...
OKAY [ 0.021s]
finished. total time: 0.022s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe erase modemst2
erasing 'modemst2'...
OKAY [ 0.024s]
finished. total time: 0.025s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe flash fsg fsg.mbn
target max-sparse-size: 256MB
sending 'fsg' (517 KB)...
OKAY [ 0.112s]
writing 'fsg'...
OKAY [ 5.625s]
finished. total time: 5.741s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe erase cache
erasing 'cache'...
OKAY [ 0.305s]
finished. total time: 0.307s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe erase userdata
erasing 'userdata'...
OKAY [ 2.977s]
finished. total time: 2.979s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe oem fb_mode_clear
...
OKAY [ 0.002s]
finished. total time: 0.003s

C:\Users\PC\Desktop\MOTO G\motog1>mfastboot.exe reboot-bootloader
rebooting into bootloader...
OKAY [ 0.003s]
finished. total time: 0.004s

C:\Users\PC\Desktop\MOTO G\motog1>pause
Premere un tasto per continuare . . .

Then, if i try to select normal powerup, there is the motorola's logo (logo.bin) less than a second and it returns to fastboot--> failed to validate system image. Boot up failed.