[Moto E Q&A, Help & Troubleshooting] Akhil137:
C:\mfastboot-v2>mfastboot.exe oem lock begin

...

(bootloader) Ready to flash signed images

OKAY [ 0.089s]

finished. total time: 0.091s

C:\mfastboot-v2>mfastboot.exe flash partition gpt.bin

target max-sparse-size: 256MB

sending 'partition' (32 KB)...

OKAY [ 0.065s]

writing 'partition'...

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 0.668s

C:\mfastboot-v2>mfastboot.exe flash motoboot motoboot.img

target max-sparse-size: 256MB

sending 'motoboot' (1669 KB)...

OKAY [ 0.140s]

writing 'motoboot'...

(bootloader) Motoboot: Preflash validation for tz

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 0.641s

C:\mfastboot-v2>mfastboot.exe flash logo logo.bin

target max-sparse-size: 256MB

sending 'logo' (460 KB)...

OKAY [ 0.100s]

writing 'logo'...

OKAY [ 0.150s]

finished. total time: 0.258s

C:\mfastboot-v2>mfastboot.exe flash boot boot.img

target max-sparse-size: 256MB

sending 'boot' (10200 KB)...

OKAY [ 0.428s]

writing 'boot'...

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 1.162s

C:\mfastboot-v2>mfastboot.exe flash recovery recovery.img

target max-sparse-size: 256MB

sending 'recovery' (10280 KB)...

OKAY [ 0.432s]

writing 'recovery'...

OKAY [ 1.774s]

finished. total time: 2.218s

C:\mfastboot-v2>mfastboot.exe flash system system.img_sparsechunk.0

target max-sparse-size: 256MB

sending 'system' (243147 KB)...

OKAY [ 8.368s]

writing 'system'...

(bootloader) Invalid signed image

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 9.025s

C:\mfastboot-v2>mfastboot.exe flash system system.img_sparsechunk.1

target max-sparse-size: 256MB

sending 'system' (257549 KB)...

OKAY [ 8.847s]

writing 'system'...

(bootloader) Invalid signed image

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 8.904s

C:\mfastboot-v2>mfastboot.exe flash system system.img_sparsechunk.2

target max-sparse-size: 256MB

sending 'system' (204273 KB)...

OKAY [ 6.943s]

writing 'system'...

(bootloader) Invalid signed image

(bootloader) Preflash validation failed

FAILED (remote failure)

finished. total time: 7.010s

C:\mfastboot-v2>mfastboot.exe flash modem NON-HLOS.bin

target max-sparse-size: 256MB

sending 'modem' (46132 KB)...

OKAY [ 1.597s]

writing 'modem'...

OKAY [ 6.571s]

finished. total time: 8.169s

C:\mfastboot-v2>mfastboot.exe erase modemst1

erasing 'modemst1'...

OKAY [ 0.016s]

finished. total time: 0.016s

C:\mfastboot-v2>mfastboot.exe erase modemst2

erasing 'modemst2'...

OKAY [ 0.031s]

finished. total time: 0.031s

C:\mfastboot-v2>mfastboot.exe flash fsg fsg.mbn

target max-sparse-size: 256MB

sending 'fsg' (648 KB)...

OKAY [ 0.109s]

writing 'fsg'...

OKAY [ 0.348s]

finished. total time: 0.460s

C:\mfastboot-v2>mfastboot.exe erase cache

erasing 'cache'...

OKAY [ 0.533s]

finished. total time: 0.537s

C:\mfastboot-v2>mfastboot.exe erase userdata

erasing 'userdata'...

OKAY [ 5.521s]

finished. total time: 5.524s

C:\mfastboot-v2>mfastboot.exe oem lock

...

(bootloader) sst lock failure!

OKAY [ 0.029s]

finished. total time: 0.031s

C:\mfastboot-v2>pause

Press any key to continue . . .

M facing all these errors can some buddy help me in this