Database Info

Moto g stuck in bootloop! Tried flashing etc!

I have tried everything possible! The phone just keeps rebooting, it will show the warning bootloader unlocked display and then goes to a lighted black screen and repeats. I managed to relock my phone but it did not help fixing the problem. I have also tried different cables because I heard it might be the cable.
I found the firmware that gives me no error which is my service provider stock firmware:
Code:
TELUS-CA_FALCON_KXB20.9-1.10-1.39_cid14_CFC_1FF.xml
When I run the flashing processor it all works fine but when I go to the phone to choose recovery it will just reboot and not go into recovery same with factory.
Code:
(bootloader) Device is already locked!
OKAY [ 0.010s]
finished. total time: 0.010s
target reported max download size of 536870912 bytes
sending 'partition' (32 KB)...
OKAY [ 0.040s]
writing 'partition'...
(bootloader) This may take a few seconds, if a
(bootloader) different partition table is being
(bootloader) flashed since we need to backup
(bootloader) and restore a few partitions
(bootloader) Flashing primary GPT image...
(bootloader) Flashing backup GPT image...
OKAY [ 0.460s]
finished. total time: 0.500s
target reported max download size of 536870912 bytes
sending 'motoboot' (1940 KB)...
OKAY [ 0.100s]
writing 'motoboot'...
(bootloader) flashing tz ...
(bootloader) flashing rpm ...
(bootloader) flashing sdi ...
(bootloader) flashing aboot ...
(bootloader) flashing sbl1 ...
OKAY [ 1.570s]
finished. total time: 1.670s
rebooting into bootloader...
OKAY [ 0.010s]
finished. total time: 0.010s
sending 'logo' (619 KB)...
FAILED (command write failed (No such device or address))
finished. total time: -0.000s
sending 'boot' (10240 KB)...
FAILED (command write failed (No such device or address))
finished. total time: 0.000s
< waiting for device >
target reported max download size of 536870912 bytes
sending 'recovery' (10240 KB)...
OKAY [ 0.350s]
writing 'recovery'...
OKAY [ 1.070s]
finished. total time: 1.420s
target reported max download size of 536870912 bytes
sending 'system' (260912 KB)...
OKAY [ 8.191s]
writing 'system'...
OKAY [ 18.244s]
finished. total time: 26.445s
target reported max download size of 536870912 bytes
sending 'system' (239152 KB)...
OKAY [ 7.546s]
writing 'system'...
OKAY [ 14.515s]
finished. total time: 22.064s
target reported max download size of 536870912 bytes
sending 'system' (226897 KB)...
OKAY [ 7.161s]
writing 'system'...
OKAY [ 23.304s]
finished. total time: 30.469s
target reported max download size of 536870912 bytes
sending 'modem' (47484 KB)...
OKAY [ 1.557s]
writing 'modem'...
OKAY [ 2.380s]
finished. total time: 3.954s
erasing 'modemst1'...
OKAY [ 0.078s]
finished. total time: 0.078s
erasing 'modemst2'...
OKAY [ 0.109s]
finished. total time: 0.109s
target reported max download size of 536870912 bytes
sending 'fsg' (102 KB)...
OKAY [ 0.114s]
writing 'fsg'...
OKAY [ 0.083s]
finished. total time: 0.198s
erasing 'cache'...
OKAY [ 0.156s]
finished. total time: 0.156s
erasing 'userdata'...
OKAY [ 0.299s]
finished. total time: 0.299s
...
(bootloader) Device is already locked!
OKAY [ 0.016s]
finished. total time: 0.016s
rebooting...
finished. total time: 0.016s
Press any key to continue . . .

Downgade from Stock 5.0.2 to Stock 4.4.4

Hi there,
I want to downgrade my Moto G, so I've download the Stock 4.4.4 Firm and run this commands:
Code:
[email protected]:~/stock4# fastboot flash partition gpt.bin
target reported max download size of 536870912 bytes
sending 'partition' (32 KB)...
OKAY [ 0.024s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.315s
[email protected]:~/stock4# fastboot flash motoboot motoboot.img
target reported max download size of 536870912 bytes
sending 'motoboot' (1953 KB)...
OKAY [ 0.151s]
writing 'motoboot'...
(bootloader) Motoboot: Preflash validation for tz
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.421s
[email protected]:~/stock4# fastboot flash logo logo.bin
target reported max download size of 536870912 bytes
sending 'logo' (1060 KB)...
OKAY [ 0.103s]
writing 'logo'...
OKAY [ 0.150s]
finished. total time: 0.254s
[email protected]:~/stock4# fastboot flash boot boot.img
target reported max download size of 536870912 bytes
sending 'boot' (10240 KB)...
OKAY [ 0.641s]
writing 'boot'...
OKAY [ 0.957s]
finished. total time: 1.598s
[email protected]:~/stock4# fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (10240 KB)...
OKAY [ 0.682s]
writing 'recovery'...
OKAY [ 0.952s]
finished. total time: 1.635s
[email protected]:~/stock4# fastboot flash system system.img_sparsechunk.0
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.293s]
sending 'system' (261001 KB)...
OKAY [ 12.886s]
writing 'system'...
OKAY [ 16.901s]
finished. total time: 30.081s
[email protected]:~/stock4# fastboot flash system system.img_sparsechunk.1
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.289s]
sending 'system' (251184 KB)...
OKAY [ 12.618s]
writing 'system'...
OKAY [ 14.800s]
finished. total time: 27.707s
[email protected]:~/stock4# fastboot flash system system.img_sparsechunk.2
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.316s]
sending 'system' (232703 KB)...
OKAY [ 11.492s]
writing 'system'...
OKAY [ 23.038s]
finished. total time: 34.847s
[email protected]:~/stock4# fastboot flash modem NON-HLOS.bin
target reported max download size of 536870912 bytes
sending 'modem' (47152 KB)...
OKAY [ 2.487s]
writing 'modem'...
OKAY [ 2.265s]
finished. total time: 4.753s
[email protected]:~/stock4# fastboot erase modemst1
erasing 'modemst1'...
OKAY [ 0.067s]
finished. total time: 0.067s
[email protected]:~/stock4# fastboot erase modemst2
erasing 'modemst2'...
OKAY [ 0.087s]
finished. total time: 0.087s
[email protected]:~/stock4# fastboot flash fsg fsg.mbn
target reported max download size of 536870912 bytes
sending 'fsg' (102 KB)...
OKAY [ 0.087s]
writing 'fsg'...
OKAY [ 5.156s]
finished. total time: 5.243s
[email protected]:~/stock4# fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.116s]
finished. total time: 0.116s
[email protected]:~/stock4# fastboot erase userdata
erasing 'userdata'...
OKAY [ 0.256s]
finished. total time: 0.256s
[email protected]:~/stock4# fastboot reboot
rebooting...
finished. total time: 0.001s
[email protected]:~/stock4#
After restarts, it stucks at "WARNING BOOTLOADER UNLOCKED" logo.
Could anyone help me?

jochy2525 said:
Hi there,
I want to downgrade my Moto G, so I've download the Stock 4.4.4 Firm and run this commands:
Code:
[email protected]:~/stock4# fastboot flash partition gpt.bin
target reported max download size of 536870912 bytes
sending 'partition' (32 KB)...
OKAY [ 0.024s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.315s
[email protected]:~/stock4# fastboot flash motoboot motoboot.img
target reported max download size of 536870912 bytes
sending 'motoboot' (1953 KB)...
OKAY [ 0.151s]
writing 'motoboot'...
(bootloader) Motoboot: Preflash validation for tz
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.421s
[email protected]:~/stock4# fastboot flash logo logo.bin
target reported max download size of 536870912 bytes
sending 'logo' (1060 KB)...
OKAY [ 0.103s]
writing 'logo'...
OKAY [ 0.150s]
finished. total time: 0.254s
[email protected]:~/stock4# fastboot flash boot boot.img
target reported max download size of 536870912 bytes
sending 'boot' (10240 KB)...
OKAY [ 0.641s]
writing 'boot'...
OKAY [ 0.957s]
finished. total time: 1.598s
[email protected]:~/stock4# fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (10240 KB)...
OKAY [ 0.682s]
writing 'recovery'...
OKAY [ 0.952s]
finished. total time: 1.635s
[email protected]:~/stock4# fastboot flash system system.img_sparsechunk.0
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.293s]
sending 'system' (261001 KB)...
OKAY [ 12.886s]
writing 'system'...
OKAY [ 16.901s]
finished. total time: 30.081s
[email protected]:~/stock4# fastboot flash system system.img_sparsechunk.1
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.289s]
sending 'system' (251184 KB)...
OKAY [ 12.618s]
writing 'system'...
OKAY [ 14.800s]
finished. total time: 27.707s
[email protected]:~/stock4# fastboot flash system system.img_sparsechunk.2
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.316s]
sending 'system' (232703 KB)...
OKAY [ 11.492s]
writing 'system'...
OKAY [ 23.038s]
finished. total time: 34.847s
[email protected]:~/stock4# fastboot flash modem NON-HLOS.bin
target reported max download size of 536870912 bytes
sending 'modem' (47152 KB)...
OKAY [ 2.487s]
writing 'modem'...
OKAY [ 2.265s]
finished. total time: 4.753s
[email protected]:~/stock4# fastboot erase modemst1
erasing 'modemst1'...
OKAY [ 0.067s]
finished. total time: 0.067s
[email protected]:~/stock4# fastboot erase modemst2
erasing 'modemst2'...
OKAY [ 0.087s]
finished. total time: 0.087s
[email protected]:~/stock4# fastboot flash fsg fsg.mbn
target reported max download size of 536870912 bytes
sending 'fsg' (102 KB)...
OKAY [ 0.087s]
writing 'fsg'...
OKAY [ 5.156s]
finished. total time: 5.243s
[email protected]:~/stock4# fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.116s]
finished. total time: 0.116s
[email protected]:~/stock4# fastboot erase userdata
erasing 'userdata'...
OKAY [ 0.256s]
finished. total time: 0.256s
[email protected]:~/stock4# fastboot reboot
rebooting...
finished. total time: 0.001s
[email protected]:~/stock4#
After restarts, it stucks at "WARNING BOOTLOADER UNLOCKED" logo.
Could anyone help me?
Click to expand...
Click to collapse
Don't flash the bootloader & partition tables(motoboot.img & gpt.bin). Try flashing the rest. Just edit the .bat file & remove these two lines:
1.) fastboot flash partition gpt.bin
2.) fastboot flash motoboot motoboot.img
Or better you can run the commands individually(excluding motoboot.img & gpt.bin) to see the output at each step

legolas06 said:
Don't flash the bootloader & partition tables(motoboot.img & gpt.bin). Try flashing the rest. Just edit the .bat file & remove these two lines:
1.) fastboot flash partition gpt.bin
2.) fastboot flash motoboot motoboot.img
Or better you can run the commands individually(excluding motoboot.img & gpt.bin) to see the output at each step
Click to expand...
Click to collapse
Thanks for the solution!

Moto G Boot up failed Recovery

Good day everyone, I got a moto g bricked I assume because whenever y restart it when it gets past the moto logo yt just stays in a black screen, tried to use recovery but whenever y do it says boot up failed. Read somewhere that this can only be used when the phone is unlocked, tried to do it following moto's homepage instructions but after I use the key they provide me it doesnt unlock it, on fastboot it keeps saying its locked eventhough on the terminal it says succesfully unlocked.
Was thinking to flash a stock rom but I dont know wich model this moto g is and what android version it was, any suggestions are appreciated, really new with dealing with moto so I dont even know if theres a flashing tool for this tried searching for it and didnt find it.
Thanks a lot, regards.
Edit: I just found how to flash images , used a us stock rom and when Im trying to use fastboot it gives me several errors
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash partiti
on gpt.bin
target reported max download size of 536870912 bytes
sending 'partition' (32 KB)...
OKAY [ 0.031s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.324s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash modem N
ON-HLOS.bin
target reported max download size of 536870912 bytes
sending 'modem' (47476 KB)...
OKAY [ 1.528s]
writing 'modem'...
OKAY [ 0.762s]
finished. total time: 2.306s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash fsg fsg
.mbn
target reported max download size of 536870912 bytes
sending 'fsg' (102 KB)...
OKAY [ 0.073s]
writing 'fsg'...
OKAY [ 3.172s]
finished. total time: 3.245s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot erase modemst
1
erasing 'modemst1'...
OKAY [ 0.047s]
finished. total time: 0.062s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot erase modemst
2
erasing 'modemst2'...
OKAY [ 0.047s]
finished. total time: 0.047s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash logo lo
go.bin
target reported max download size of 536870912 bytes
sending 'logo' (619 KB)...
OKAY [ 0.109s]
writing 'logo'...
OKAY [ 0.062s]
finished. total time: 0.172s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash boot bo
ot.img
target reported max download size of 536870912 bytes
sending 'boot' (10240 KB)...
OKAY [ 0.389s]
writing 'boot'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.858s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash recover
y recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (10240 KB)...
OKAY [ 0.374s]
writing 'recovery'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.831s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash system
system.img_sparsechunk.0
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Permission denied
FAILED (remote failure)
finished. total time: 0.031s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash system
system.img_sparsechunk.1
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Permission denied
FAILED (remote failure)
finished. total time: 0.016s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot flash system
system.img_sparsechunk.2
target reported max download size of 536870912 bytes
erasing 'system'...
(bootloader) Permission denied
FAILED (remote failure)
finished. total time: 0.016s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.063s]
finished. total time: 0.063s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot erase userdat
a
erasing 'userdata'...
OKAY [ 0.063s]
finished. total time: 0.063s
C:\Users\Gerardo\AppData\Local\Android\sdk\platform-tools>fastboot reboot
rebooting...
Can anyone point me in the correct direction?

Bump

Unlock The Motorola G (Moto G) Bootloader! doesnt work. Flash doesnt work.

Unlock The Motorola G (Moto G) Bootloader! doesnt work. Flash doesnt work.
ok This is what I did.
Go Motorola Moto G 3rd Gen. Android 5.0.1, than I download the KingRoot App, to uninstall some bloadware apps. was fine. than few days ago, I updated Motorola to Android 6. Next day I watched some youtube videos and it went to hard reset mode. Since than I can do nothing. Cant unlock the boot loader even with the code from Motorola. Cant flash it just nothing. Im out of ideas. Would like to take a hammer and just smash it. Please someone help me. And I cant turn on the developer mode. take a look on the error which I get, over and over and over again.
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>adb reboot-bootloader
error: device '(null)' not found
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot devices
ZY2225JZ7Z fastboot
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>adb reboot-bootloader
error: device '(null)' not found
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot oem fb_mode_set
...
OKAY [ 0.130s]
finished. total time: 0.140s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash partition gp
t.bin
target reported max download size of 268435456 bytes
sending 'partition' (32 KB)...
OKAY [ 0.090s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.600s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash bootloader b
ootloader.img
target reported max download size of 268435456 bytes
sending 'bootloader' (2546 KB)...
OKAY [ 0.270s]
writing 'bootloader'...
(bootloader) flashing sbl1 ...
(bootloader) flashing aboot ...
(bootloader) flashing tz ...
(bootloader) flashing hyp ...
(bootloader) flashing rpm ...
OKAY [ 1.850s]
finished. total time: 2.130s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash bootloader b
ootloader.img
target reported max download size of 268435456 bytes
sending 'bootloader' (2546 KB)...
OKAY [ 0.250s]
writing 'bootloader'...
(bootloader) flashing sbl1 ...
(bootloader) flashing aboot ...
(bootloader) flashing tz ...
(bootloader) flashing hyp ...
(bootloader) flashing rpm ...
OKAY [ 1.890s]
finished. total time: 2.150s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash logo logo.bi
n
target reported max download size of 268435456 bytes
sending 'logo' (917 KB)...
OKAY [ 0.220s]
writing 'logo'...
OKAY [ 0.180s]
finished. total time: 0.410s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash boot boot.im
g
target reported max download size of 268435456 bytes
sending 'boot' (16384 KB)...
OKAY [ 0.680s]
writing 'boot'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 1.350s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash recovery rec
overy.img
target reported max download size of 268435456 bytes
sending 'recovery' (16484 KB)...
OKAY [ 0.670s]
writing 'recovery'...
OKAY [ 1.410s]
finished. total time: 2.090s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash system syste
m.img_sparsechunk.0
target reported max download size of 268435456 bytes
sending 'system' (261561 KB)...
OKAY [ 8.290s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.970s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash system syste
m.img_sparsechunk.1
target reported max download size of 268435456 bytes
sending 'system' (262142 KB)...
OKAY [ 8.310s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.440s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash system syste
m.img_sparsechunk.2
target reported max download size of 268435456 bytes
sending 'system' (262140 KB)...
OKAY [ 8.310s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.470s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash system syste
m.img_sparsechunk.3
target reported max download size of 268435456 bytes
sending 'system' (240126 KB)...
OKAY [ 7.620s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 7.710s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash system syste
m.img_sparsechunk.4
target reported max download size of 268435456 bytes
sending 'system' (242526 KB)...
OKAY [ 7.700s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 7.820s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash system syste
m.img_sparsechunk.5
target reported max download size of 268435456 bytes
sending 'system' (121656 KB)...
OKAY [ 3.910s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 4.030s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash modem NON-HL
OS.bin
< waiting for device >
target reported max download size of 268435456 bytes
sending 'modem' (36932 KB)...
OKAY [ 1.170s]
writing 'modem'...
OKAY [ 2.430s]
finished. total time: 3.620s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot erase modemst1
erasing 'modemst1'...
OKAY [ 0.060s]
finished. total time: 0.070s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot erase modemst2
erasing 'modemst2'...
OKAY [ 0.030s]
finished. total time: 0.030s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot flash fsg fsg.mbn
target reported max download size of 268435456 bytes
sending 'fsg' (1923 KB)...
OKAY [ 0.250s]
writing 'fsg'...
OKAY [ 0.170s]
finished. total time: 0.420s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot erase cache
erasing 'cache'...
OKAY [ 0.130s]
finished. total time: 0.140s
C:\Users\Nikon\Desktop\adb-fastboot-latest_win_linux>fastboot reboot
rebooting...
Please someone help

plz tell me you didnt flash an android 5.0 bootloader.img on a device that has been previously updated to 6.0 .. . If you did then you may have hard bricked it. Try downloading 6.0 firmware

therealduff1 said:
plz tell me you didnt flash an android 5.0 bootloader.img on a device that has been previously updated to 6.0 .. . If you did then you may have hard bricked it. Try downloading 6.0 firmware
Click to expand...
Click to collapse
Thank you for your Info. never thought that it would be so quick here. So yesterday I downloaded android 6, did the flashing again. and it works fine now.
So for all the other Motorola Moto G 3rd generations users.
When you root the phone in Android 5, and you update it with official OTA Android 6, don't root the phone again with some App like KingRoot, as the phone OS might be bricked. Also to flash the Motorola, in that status which I got. You don't need the boot loader unlocking code from Motorola, eather you don't need to activate developer mode. Just download Android 6, and flash it. FASTBOOT DEVICES - code to be sure your phone is recognize it by your PC.
Thanks again to the XDA people and (therealduff1) which help me very quick

[HELP] Relock Moto G 2015 (XT1540 2GB) Bootloader

Hi there, i unlocked the bootloader of my Moto G 2015 XT1540 to play with it and install custom ROMs, but now i want to relock it because i want to gift it to my mother.
I've tried several tutorials about it but it fails. (I used XT1540_OSPREY_RETUS_2GB_6.0_MPI24.65-25.1_cid9 firmware from the index on XDA).
Code:
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot oem lock begin
...
(bootloader) Please fully flash the signed build before locking phone!
OKAY [ 0.027s]
finished. total time: 0.027s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot oem fb_mode_set
...
OKAY [ 0.007s]
finished. total time: 0.007s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash logo logo.bin
target reported max download size of 268435456 bytes
sending 'logo' (1352 KB)...
OKAY [ 0.049s]
writing 'logo'...
OKAY [ 0.051s]
finished. total time: 0.107s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash boot boot.img
target reported max download size of 268435456 bytes
sending 'boot' (16384 KB)...
OKAY [ 0.524s]
writing 'boot'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 1.060s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash recovery recovery.img
target reported max download size of 268435456 bytes
sending 'recovery' (16484 KB)...
OKAY [ 0.527s]
writing 'recovery'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 1.068s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.0
target reported max download size of 268435456 bytes
sending 'system' (251797 KB)...
OKAY [ 7.901s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.355s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.1
target reported max download size of 268435456 bytes
sending 'system' (257238 KB)...
OKAY [ 8.073s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.112s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.2
target reported max download size of 268435456 bytes
sending 'system' (262142 KB)...
OKAY [ 8.223s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.266s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.3
target reported max download size of 268435456 bytes
sending 'system' (262140 KB)...
OKAY [ 8.227s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.302s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.4
target reported max download size of 268435456 bytes
sending 'system' (262142 KB)...
OKAY [ 8.238s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.278s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.5
target reported max download size of 268435456 bytes
sending 'system' (255933 KB)...
OKAY [ 8.030s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 8.070s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash system system.img_sparsechunk.6
target reported max download size of 268435456 bytes
sending 'system' (112244 KB)...
OKAY [ 3.525s]
writing 'system'...
(bootloader) Invalid signed image
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 3.555s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash modem NON-HLOS.bin
target reported max download size of 268435456 bytes
sending 'modem' (36984 KB)...
OKAY [ 1.170s]
writing 'modem'...
OKAY [ 0.562s]
finished. total time: 1.739s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot erase modemst1
erasing 'modemst1'...
OKAY [ 0.020s]
finished. total time: 0.024s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot erase modemst2
erasing 'modemst2'...
OKAY [ 0.015s]
finished. total time: 0.019s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot flash fsg fsg.mbn
target reported max download size of 268435456 bytes
sending 'fsg' (2159 KB)...
OKAY [ 0.077s]
writing 'fsg'...
OKAY [ 0.059s]
finished. total time: 0.140s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot erase cache
erasing 'cache'...
OKAY [ 0.019s]
finished. total time: 0.024s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot erase userdata
erasing 'userdata'...
OKAY [ 0.081s]
finished. total time: 0.085s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot erase customize
erasing 'customize'...
OKAY [ 0.018s]
finished. total time: 0.022s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot erase clogo
erasing 'clogo'...
OKAY [ 0.028s]
finished. total time: 0.032s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot oem fb_mode_clear
...
OKAY [ 0.006s]
finished. total time: 0.011s
C:\Users\victo\Downloads\adb-fastboot-latest_win_linux>fastboot oem lock
...
(bootloader) Please flash valid signed images just after lock begin
(bootloader) command!
OKAY [ 0.033s]
finished. total time: 0.037s
Thanks in advance

geminis3 said:
Hi there, i unlocked the bootloader of my Moto G 2015 XT1540 to play with it and install custom ROMs, but now i want to relock it because i want to gift it to my mother.
I've tried several tutorials about it but it fails. (I used XT1540_OSPREY_RETUS_2GB_6.0_MPI24.65-25.1_cid9 firmware from the index on XDA).
Thanks in advance
Click to expand...
Click to collapse
The build you're flashing is older than the one that's installed on the phone. That's why you are getting the 'preflash validation failure' message.
Also, I don't see the need to lock the bootloader even if you are giving it to someone else. Just flash the stock firmware. Skip the bootloader and gpt files, flash everything else.

Actually, you are doing this completely wrong... You don't mix oem commands (lock begin and fb_mode_set are exclusive of each other, at least I have never seen a guide that uses them together, so it's deduction), but that isn't your core problem... @adityak1303 hit on that, you are getting "preflash validation errors" which generally means the pieces you are flashing are older than is what is installed. Very common actually since we do not have the latest factory images currently. The kicker here is although you can likely get it functional again, you can't lock the bootloader without being able to flash each piece of a complete ROM image, which you can't do without having a newer image, meaning ALL pieces, you must flash gpt.bin and bootloader, and every piece to relock.
Why the urge to relock? You know it will never go back to the way it was, you will still have to use the modified logo.bin to cover the unlock warning page (that never goes away) and the bootloader and getvar will always show it has been unlocked... There is no point except pure security to relock the bootloader, but you will still know it was once unlocked.

Thanks for your help, I flashed stock ROM (without gpt.bin and bootloader.bin), custom logo.bin and yep it works also I got the January OTA.