Database Develop

Fastboot loop, "failed for boot", Moto g 4G XT1072

Hello!
Today I restarted my Motorola Moto G 4G XT1072 (2nd gen) because I thought it was slow. I turned it off and on again and surprise! : it boots into fastboot. Here is what the screen displays:
HTML:
AP Fastboot Flash Mode (S)
48.21 (sha-d8d8d9e, 2015-04-29 11:53:52)
CPU: MSM8926
eMMC : 8GB Sandisk RV=06 PV=07 TY=17
DRAM : 1024 MB Elpida S4 SDRAM DIE=4Gb
Battery OK
Device is LOCKED. Status Code : 0
Connect USB Data Cable
Boot Mode Selection Menu
Vol Up Selects, Vol Down Scrolls
Normal Powerup
Recovery
Factory
Barcodes
BP Tools
hab check failed for boot
Failed to verify hab image boot
failed to validate boot image
Fastboot reason: Fall-through from not-charger boot mode
Hitting Normal Powerup or Factory reboots the phone on fastboot again, and Recovery sends me on a black screen with a broken android image (red triangle).
I think I know where this comes from as I rooted my phone last week end to use a file recovering app. I used kingroot and I read today that it was a bad idea...
I've tried installing a new rom following this guide: http://forum.xda-developers.com/mot...e-restore-moto-e-2015-stock-firmware-t3054303 and using this rom : STOCK EU: RETEUALL_XT1072_5.0.2_LXB22.46-28_cid7_subsidy-DEFAULT_CFC.xml.ZIP
But unfortunately, when I type the first command line this happens:
target max-sparse-size: 256MB
sending 'partition' (32 KB)...
OKAT [0.047s]
writing 'partition'...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 0.393s
I tried others command lines and I get others errors such as "Invalid signed image"..
I don't know much about android programming, so I don't know what to do. I searched a lot on the internet but didn't find any solutions. Do you have any idea ? I wish I could solve this problem tonight so I can get a working phone as soon as possible.. Thanks in advance for your time!

I fixed this by unlocking the bootloader : http://forum.xda-developers.com/moto-g-2014/general/wip-unlock-bootloader-moto-g-2nd-gen-t2875728.
Topic can be locked.

SOLVED: (bootloader) Preflash validation failed, even though I'm unlocked

I was following this guide in order to update my formerly rooted bootloader unlocked Nexus 6. I've been able to follow those instructions in the past to update my phone, but something went wrong this time. I'm on the MMB29Q version, so I downloaded the MMB29Q to MMB29V update, the link to which I found on this site. I also downloaded the MMB29Q factory image from Google's list of them and extracted the system.img file. My phone has the stock recovery, and my computer is on Arch Linux with adb version 1.0.36 and fastboot version 7.1.2_r6.
I was able to erase the system image easily enough:
Code:
$ ~ adb reboot bootloader
$ ~ fastboot erase system
(bootloader) slot-count: not found
(bootloader) slot-suffixes: not found
(bootloader) slot-suffixes: not found
(bootloader) has-slot:system: not found
erasing 'system'...
(bootloader) Erase allowed in unlocked state
OKAY [ 0.673s]
finished. total time: 0.673s
However, when I then tried to flash the system image,
Code:
$ ~ fastboot flash system system.img
(bootloader) slot-count: not found
(bootloader) slot-suffixes: not found
(bootloader) slot-suffixes: not found
(bootloader) has-slot:system: not found
target reported max download size of 536870912 bytes
sending sparse 'system' 1/4 (518702 KB)...
OKAY [ 16.242s]
writing 'system' 1/4...
(bootloader) Preflash validation failed
FAILED (remote failure)
finished. total time: 16.250s
it failed on me. According to the bootloader splash screen, my "Device is UNLOCKED. Status Code: 3" (I read somewhere that the Preflash validation failed message corresponds with an unlocked bootloader).
One other thing to note is that I remember leaving the checkbox for allowing oem unlock in developer options unchecked, which I am now realizing was probably where I went wrong (I ran fastboot oem unlock as a test, and it told me to Check 'Allow OEM Unlock' in Developer Options). However, because I cleared the system image, I don't know how I can change that setting anymore. I also realize that I didn't need to do this step in the updating process because my phone was already unrooted and thus system.img should have been stock (I think, at least). I tried re-erasing the system image and reflashing it, but that unfortunately did not fix anything. Any advice would be much appreciated!

Progress! I was able to flash TWRP, back up all my data just in case, and then follow this guide, which toggles the "Allow OEM Unlock" developer settings without having a working operating system. Running fastboot oem unlock no longer gives the error about checking that box in Settings. However, I'm still getting that same error when I try to flash the system.img. After that failed, I am fresh out of ideas, given that the problem does not seem to be that option. Anyone have any ideas?
Edit: I now realize I am a moron. I found this thread on Android.SE and realized that I had in fact downloaded the Nexus 6P MMB29Q version and that is why it failed. After downloading the correct verion, rewiping the system partition, and reflashing it, my phone works again!

Help me !! remote : flash_cmds error

i have zenfone 4 A400CG(kitkat) always display error facebook, system ui, youtube etc. now i flash with same rom.
on adb folder i type in cmd : fastboot flash boot boot.img(success) but when i type fastboot flash fasboot fastboot.img
"Failed (remote : flash_cmds error !" can u help me ?
flash cmds error solve problem, now i flash error : "fail: no enought DATA space,please free 998 MB at least"
i try flash raw file in SD Download, after that stuck Asus logo. help me...

Motorola XT890 Partition Problem

hello
i need help reflashing my phone from a software error it's seem's the software is corrupt and not letting me flash it,
After flashing various firmware's including the original stock and this one (VZW_XT907_4.4.2-KDA20.62-15.1_1FF.xml) 4.4.2 Android Kitkat with RSD Lite im getting the following error,
Fastboot Reason:
fastboot: max download size: 100MB
USB connected
Getvar max-sparse-size
Fastboot command failed
Getvar max-download-size
Downloading . . .
not found partition partition
E:No partition partition exisiting
Fastboot command failed

Hello,
Test flash with fastboot, with the gpt.bin file that I attached.
Code:
fastboot flash gpt gpt.bin
successes

Moto G6 Forge - Cannot flash to recovery

I have a Moto G6 Forge Cricket that I forgot the password to. I have been trying to boot into another image without data loss in order to go in and delete the password config files, but have not been able to get anything to work. USB debugging doesn't seem to be on, the bootloader is locked, and I have no idea if it's possible. I can access fastboot and android recovery. Fastboot says the product variant is "jeter XT1922-9", leading me to believe that it's just a reskinned moto g6 Play.
I have tried recovery loading update aroma file manager from SD card, which failed signature check. Updating over adb doesn't work, as the phone doesn't show up in adb at all, only fastboot.
I tried flashing TWRP recovery for the moto g6, and got the following output on PC:
C:\Android\SDK\platform-tools>fastboot flash recovery twrp.img
(bootloader) is-logical:recovery: not found
Sending 'recovery' (17626 KB) OKAY [ 0.559s]
Writing 'recovery' (bootloader) Image recovery failed validation
(bootloader) Preflash validation failed
FAILED (remote: '')
fastboot: error: Command failed
On the phone, I see a series of yellow cmd log lines leading up to "cmd: flash:recovery" followed by pink "Mismatched partition size (recovery)" Some posts said that this was an ignorable error and to just proceed into recovery, but when I did it just went to the normal android recovery.
I also tried just using fastboot boot, but that obviously didn't work due to the locked bootloader.
C:\Android\SDK\platform-tools>fastboot boot twrp.img
Sending 'boot.img' (17626 KB) OKAY [ 0.563s]
Booting (bootloader) permission denied!
FAILED (remote: '')
fastboot: error: Command failed
I'm out of ideas and out of google search results that aren't SEO spam to read. If anyone knows something else I could try I would be happy to hear it. Thank you so much!

The only thing I can think of is using the factory recovery to erase the user partition / factory reset.