[Moto X4 Questions & Answers] achyut:
Okay, I had a perfectly working Moto X4 (Indian Retail version), rooted and debloated. But then the idea of going back to unrooted struck me and I flashed the ROM with no problem. Then, I went back to the Bootloader (Had USB Debugging turned on and OEM Unlock "NOT" turned on in the Developer Options) and locked the bootloader by running oem lock and then, the Phone won't boot -

It gave me the message --

" Your Device is Corrupt. It can't be trusted and will not boot."

From then, I've tried reflashing the firmware - No luck.

It gives a "Permission denied" message in cmd and fails.

Unlocking the OEM worked with the get_unlock_data but then it asked me to turn on USB debugging in the developer options (and I can' boot the phone past the message).

I've tried booting into recovery, won't work - just the same message. Tried booting into the bootable TWRP - Won't work. Same message.

Fastboot erase cache erases the cache and won't do anything else.

PLEASE HELP ME. PLEASE....​

The CMD error log reads as -->

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot devices
ZY224JGPK4 fastboot

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash partition gpt.bin
target reported max download size of 536870912 bytes
sending 'partition' (37 KB)...
OKAY [ 0.004s]
writing 'partition'...
(bootloader) Validating 'gpt.default.xml'
(bootloader) Committing 'gpt.default.xml'
(bootloader) - flashing 'gpt_main0.bin' to 'partition:0'
OKAY [ 0.115s]
finished. total time: 0.123s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash bootloader bootloa
der.img
target reported max download size of 536870912 bytes
sending 'bootloader' (9520 KB)...
OKAY [ 0.237s]
writing 'bootloader'...
(bootloader) Validating 'bootloader.default.xml'
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) flash permission denied
(bootloader) Cancelling 'bootloader.default.xml'
FAILED (remote failure)
finished. total time: 0.344s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.003s]
finished. total time: 0.004s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash modem NON-HLOS.bin

target didn't report max-download-size
sending 'modem' (95999 KB)...
FAILED (command write failed (No error))
finished. total time: 0.010s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash fsg fsg.mbn
target didn't report max-download-size
sending 'fsg' (5508 KB)...
FAILED (command write failed (No error))
finished. total time: 0.008s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot erase modemst1
erasing 'modemst1'...
FAILED (command write failed (No error))
finished. total time: 0.003s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot erase modemst2
erasing 'modemst2'...
FAILED (command write failed (No error))
finished. total time: 0.002s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash bluetooth BTFM.bin

target didn't report max-download-size
sending 'bluetooth' (4540 KB)...
FAILED (command write failed (No error))
finished. total time: 0.003s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash dsp dspso.bin
target didn't report max-download-size
sending 'dsp' (16384 KB)...
FAILED (command write failed (No error))
finished. total time: 0.002s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash logo logo.bin
target didn't report max-download-size
sending 'logo' (2153 KB)...
FAILED (command write failed (No error))
finished. total time: 0.003s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash boot boot.img
< waiting for any device >
target reported max download size of 536870912 bytes
sending 'boot_a' (19853 KB)...
OKAY [ 0.438s]
writing 'boot_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 0.453s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.0
target reported max download size of 536870912 bytes
sending 'system_a' (516148 KB)...
OKAY [ 11.396s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 11.400s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.1
target reported max download size of 536870912 bytes
sending 'system_a' (522692 KB)...
OKAY [ 15.666s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 15.671s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.2
target reported max download size of 536870912 bytes
sending 'system_a' (521055 KB)...
OKAY [ 15.620s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 15.626s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.3
target reported max download size of 536870912 bytes
sending 'system_a' (523959 KB)...
OKAY [ 15.885s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 15.893s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.4
target reported max download size of 536870912 bytes
sending 'system_a' (521817 KB)...
OKAY [ 16.218s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 16.226s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.5
target reported max download size of 536870912 bytes
sending 'system_a' (522195 KB)...
OKAY [ 16.019s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 16.026s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.6
target reported max download size of 536870912 bytes
sending 'system_a' (524276 KB)...
OKAY [ 16.235s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 16.242s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system system.img_
sparsechunk.7
target reported max download size of 536870912 bytes
sending 'system_a' (167142 KB)...
OKAY [ 3.634s]
writing 'system_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 3.644s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash system_b system_ot
her.img
target reported max download size of 536870912 bytes
sending 'system_b' (134369 KB)...
OKAY [ 2.931s]
writing 'system_b'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 2.942s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot flash oem oem.img
target reported max download size of 536870912 bytes
sending 'oem_a' (237897 KB)...
OKAY [ 5.203s]
writing 'oem_a'...
(bootloader) flash permission denied
FAILED (remote failure)
finished. total time: 5.209s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot erase carrier
erasing 'carrier'...
(bootloader) Permission denied
FAILED (remote failure)
finished. total time: 0.005s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot erase userdata
erasing 'userdata'...
(bootloader) Permission denied
FAILED (remote failure)
finished. total time: 0.003s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>fastboot erase ddr
erasing 'ddr'...
(bootloader) Permission denied
FAILED (remote failure)
finished. total time: 0.016s

C:\Users\Achyut\Desktop\MOTO X4\platform-tools>