Gracias Bro, pos hice todo y no pasa de la ventada de Warning Bootloader Unlocked Adjunto la ventanda de comandos...
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash partition gpt.bin
target max-sparse-size: 256MB
sending 'partition' (32 KB)...
OKAY [ 0.036s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.336s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.003s]
finished. total time: 0.003s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash logo logo.bin
target max-sparse-size: 256MB
sending 'logo' (1060 KB)...
OKAY [ 0.063s]
writing 'logo'...
OKAY [ 0.102s]
finished. total time: 0.167s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash boot boot.img
target max-sparse-size: 256MB
sending 'boot' (10240 KB)...
OKAY [ 0.350s]
writing 'boot'...
OKAY [ 0.790s]
finished. total time: 1.143s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash recovery recovery.img
target max-sparse-size: 256MB
sending 'recovery' (10240 KB)...
OKAY [ 0.357s]
writing 'recovery'...
OKAY [ 0.803s]
finished. total time: 1.164s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash system system.img_sparsechunk.0
target max-sparse-size: 256MB
sending 'system' (259625 KB)...
OKAY [ 8.186s]
writing 'system'...
OKAY [ 9.944s]
finished. total time: 18.131s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash system system.img_sparsechunk.1
target max-sparse-size: 256MB
sending 'system' (237648 KB)...
OKAY [ 8.078s]
writing 'system'...
OKAY [ 8.034s]
finished. total time: 16.114s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash system system.img_sparsechunk.2
target max-sparse-size: 256MB
sending 'system' (254059 KB)...
OKAY [ 8.062s]
writing 'system'...
OKAY [ 9.219s]
finished. total time: 17.282s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash system system.img_sparsechunk.3
target max-sparse-size: 256MB
sending 'system' (11724 KB)...
OKAY [ 0.416s]
writing 'system'...
OKAY [ 0.416s]
finished. total time: 0.834s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash modem NON-HLOS.bin
target max-sparse-size: 256MB
sending 'modem' (59132 KB)...
OKAY [ 1.903s]
writing 'modem'...
OKAY [ 2.055s]
finished. total time: 3.959s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot erase modemst1
erasing 'modemst1'...
OKAY [ 0.022s]
finished. total time: 0.023s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot erase modemst2
erasing 'modemst2'...
OKAY [ 0.039s]
finished. total time: 0.040s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot flash fsg fsg.mbn
target max-sparse-size: 256MB
sending 'fsg' (710 KB)...
OKAY [ 0.090s]
writing 'fsg'...
OKAY [ 5.277s]
finished. total time: 5.369s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot erase cache
erasing 'cache'...
OKAY [ 0.150s]
finished. total time: 0.151s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot erase userdata
erasing 'userdata'...
OKAY [ 0.444s]
finished. total time: 0.445s
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>
C:\Users\Engels Calderon\Downloads\XT1045_AMX-PE-SS_4.4.4_KXB21.14-L1.54_cid12_C
FC_1FF.xml>mfastboot reboot
rebooting...