[Moto E Q&A, Help & Troubleshooting] superazo:
Hi everyone! I have a problem with my Moto E XT1021. Some time ago I updated my device to Lollipop. Everything was ok but after a while it stopped working... Meantime I changed my device, so i put my Moto E in a drawer! Now I wanna use it again, but I have a lot of problem with fastboot (that's the only stage that works on my phone).

I tried to repeat the process for install the original firmware (http://xdaforums.com/showthread.php?t=2755857) but i had always the same errors:

root@andrea-desktop:# fastboot flash partition gpt.bin
target reported max download size of 299892736 bytes
sending 'partition' (32 KB)...
OKAY [ 0.072s]
writing 'partition'...
(bootloader) Preflash validation failed
[COLOR="Red"]FAILED[/COLOR] (remote failure)
finished. total time: 0.650s
root@andrea-desktop:# fastboot flash motoboot motoboot.img
target reported max download size of 299892736 bytes
sending 'motoboot' (1669 KB)...
OKAY [ 0.149s]
writing 'motoboot'...
(bootloader) flashing tz ...
(bootloader) flashing rpm ...
(bootloader) flashing sdi ...
(bootloader) flashing aboot ...
(bootloader) flashing sbl1 ...
OKAY [ 3.263s]
finished. total time: 3.412s
root@andrea-desktop:# fastboot flash logo logo.bin
target reported max download size of 299892736 bytes
sending 'logo' (527 KB)...
OKAY [ 0.113s]
writing 'logo'...
OKAY [ 0.155s]
finished. total time: 0.268s
root@andrea-desktop:# fastboot flash boot boot.img
target reported max download size of 299892736 bytes
sending 'boot' (10200 KB)...
OKAY [ 0.411s]
writing 'boot'...
(bootloader) Preflash validation failed
[COLOR="red"]FAILED[/COLOR] (remote failure)
finished. total time: 1.121s
root@andrea-desktop:# fastboot flash recovery recovery.img
target reported max download size of 299892736 bytes
sending 'recovery' (10280 KB)...
OKAY [ 0.412s]
writing 'recovery'...
OKAY [ 1.785s]
finished. total time: 2.197s
root@andrea-desktop:# fastboot flash system system.img_sparsechunk.0
target reported max download size of 299892736 bytes
sending 'system' (242987 KB)...
OKAY [ 7.674s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
[COLOR="red"]FAILED[/COLOR] (remote failure)
finished. total time: 8.332s
root@andrea-desktop:# fastboot flash system system.img_sparsechunk.1
target reported max download size of 299892736 bytes
sending 'system' (256535 KB)...
OKAY [ 8.104s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
[COLOR="red"]FAILED[/COLOR] (remote failure)
finished. total time: 8.188s
root@andrea-desktop:# fastboot flash system system.img_sparsechunk.2
target reported max download size of 299892736 bytes
sending 'system' (257126 KB)...
OKAY [ 8.121s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
[COLOR="red"]FAILED[/COLOR] (remote failure)
finished. total time: 8.183s
root@andrea-desktop:# fastboot flash system system.img_sparsechunk.3
target reported max download size of 299892736 bytes
sending 'system' (45848 KB)...
OKAY [ 1.515s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
[COLOR="red"]FAILED[/COLOR] (remote failure)
finished. total time: 1.570s
root@andrea-desktop:# fastboot flash modem NON-HLOS.bin
target reported max download size of 299892736 bytes
sending 'modem' (46232 KB)...
OKAY [ 1.531s]
writing 'modem'...
OKAY [ 4.763s]
finished. total time: 6.294s
root@andrea-desktop:# fastboot erase modemst1
erasing 'modemst1'...
OKAY [ 0.055s]
finished. total time: 0.055s
root@andrea-desktop:# fastboot erase modemst2
erasing 'modemst2'...
OKAY [ 0.054s]
finished. total time: 0.054s
root@andrea-desktop:# fastboot flash fsg fsg.mbn
target reported max download size of 299892736 bytes
sending 'fsg' (648 KB)...
OKAY [ 0.110s]
writing 'fsg'...
OKAY [ 0.165s]
finished. total time: 0.275s
root@andrea-desktop:# fastboot erase cache
erasing 'cache'...
OKAY [ 0.369s]
finished. total time: 0.369s

After few try i unlocked bootloader, and the process was done ok (also if i read "Device is locked. Status code:0" is it normal?).

I tried to flash CWM or TWRP but without success. Always the same error: failed to validate system image.

Someone can help me?

Sorry for my english...:o