[Moto G Q&A, Help & Troubleshooting] Lealdpo:
Thanks for you help me, i tried flash the stock rom kk 4.4.4, view the log:

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot devices
0423483639 fastboot

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

boot boot.img
target reported max download size of 536870912 bytes
sending 'boot' (10240 KB)...
OKAY [ 0.410s]
writing 'boot'...
OKAY [ 0.699s]
finished. total time: 1.121s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (10240 KB)...
OKAY [ 0.423s]
writing 'recovery'...
OKAY [ 0.702s]
finished. total time: 1.133s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

system system.img_sparsechunk.0
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.520s]
sending 'system' (249379 KB)...
OKAY [ 9.251s]
writing 'system'...
(bootloader) WARNING: System partition size is 0x34800000
(bootloader) Only multiples of 0x1000000 allowed for write-protection
(bootloader) Write protect will not be enabled
OKAY [ 7.053s]
finished. total time: 16.841s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

system system.img_sparsechunk.1
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.512s]
sending 'system' (252566 KB)...
OKAY [ 9.405s]
writing 'system'...
(bootloader) WARNING: System partition size is 0x34800000
(bootloader) Only multiples of 0x1000000 allowed for write-protection
(bootloader) Write protect will not be enabled
OKAY [ 6.521s]
finished. total time: 16.458s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

system system.img_sparsechunk.2
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.515s]
sending 'system' (249711 KB)...
OKAY [ 9.095s]
writing 'system'...
(bootloader) WARNING: System partition size is 0x34800000
(bootloader) Only multiples of 0x1000000 allowed for write-protection
(bootloader) Write protect will not be enabled
OKAY [ 7.147s]
finished. total time: 16.771s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

modem NON-HLOS.bin
target reported max download size of 536870912 bytes
sending 'modem' (47152 KB)...
OKAY [ 1.749s]
writing 'modem'...
OKAY [ 1.209s]
finished. total time: 2.971s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot erase

modemst1
erasing 'modemst1'...
OKAY [ 0.062s]
finished. total time: 0.067s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot erase

modemst2
erasing 'modemst2'...
OKAY [ 0.063s]
finished. total time: 0.070s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash fsg

fsg.mbn
target reported max download size of 536870912 bytes
sending 'fsg' (102 KB)...
OKAY [ 0.100s]
writing 'fsg'...
OKAY [ 5.569s]
finished. total time: 5.682s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot erase

cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.329s]
finished. total time: 0.336s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot erase

userdata
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [ 2.927s]
finished. total time: 2.934s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

logo logo.bin
target reported max download size of 536870912 bytes
sending 'logo' (1060 KB)...
OKAY [ 0.132s]
writing 'logo'...
OKAY [ 0.116s]
finished. total time: 0.263s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot flash

recovery twrp.img
target reported max download size of 536870912 bytes
sending 'recovery' (8480 KB)...
OKAY [ 0.379s]
writing 'recovery'...
OKAY [ 0.304s]
finished. total time: 0.695s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>fastboot reboot
rebooting...

finished. total time: 0.003s

C:\Users\Rafael\Documents\Android Devices\Moto G XT-1033\ADB>

Result: Bootloop