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LG GPAD 7 stuck on Fast Boot

Purchased an Lg Gpad 7 Wifi tablet (v400) 2 weeks ago. Came with preinstalled Lollipop android so i couldnt install a recovery rom to flash any other custom roms. Downgraded to Kitkat version following the instructions on Xda forums and succesfully installed Twrp. When i installed Cyanogenmod 12.1 through Twrp i got stuck in fastboot screen.
Any suggestions and / or solutions would be greatly appreciated.

I had a similar problem.. Only mine was stuck at the bootloader. Go in TWRP and repair /data and other partitions. My data partition gave me an error since F2FS is a little flaky and some ROMs corrupted it (claimed they supported it). I would recommend erasing the system, cache and data partition if you can't get into TWRP.

The problem is i cant get out of fastboot whatever i try. It says start on bootloader but the tablet just restarts on an empty screen doing nothing.

Hakalai said:
The problem is i cant get out of fastboot whatever i try. It says start on bootloader but the tablet just restarts on an empty screen doing nothing.
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if you have an sd card, try removing that, then reboot.
if that doesnt work, try entering fastboot command, fastboot continue

Tried without sdcard and i get the same fastboot screen.
How can i give any commands? The only options i have are Restart Bootloader / Restart / Power off. Tried restarting bootloader but i get nothing in return tablet just stays on with nothing on screen.

Hakalai said:
Tried without sdcard and i get the same fastboot screen.
How can i give any commands? The only options i have are Restart Bootloader / Restart / Power off. Tried restarting bootloader but i get nothing in return tablet just stays on with nothing on screen.
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Click to collapse
you said it was stuck on fastboot, if thats the case, install any needed drivers on your pc, connect device to it, open a terminal in the fastboot dir (after you go get fastboot), then try those commands i gave. you could also try, fastboot reboot dont think i mentioned that before.

bweN diorD said:
you said it was stuck on fastboot, if thats the case, install any needed drivers on your pc, connect device to it, open a terminal in the fastboot dir (after you go get fastboot), then try those commands i gave. you could also try, fastboot reboot dont think i mentioned that before.
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Click to collapse
Did as you said but every command i gave gives me an error message in adb terminal. There are new lines in fastboot menu in tablet now. Bottom two are SECURE BOOT - enabled & LOCK STATE - locked.

Hakalai said:
Did as you said but every command i gave gives me an error message in adb terminal. There are new lines in fastboot menu in tablet now. Bottom two are SECURE BOOT - enabled & LOCK STATE - locked.
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Click to collapse
hmm, ok, im guessing it would have said that normally, when not broken. all the command does is try to release it past where its stuck. it doesnt actually flash, lock, unlock, or change anything.
imo, this seems good, because now we know fastboot is working.
i own lg devices, but not your specific device. i would hate to give you some bad advice and make your tablet broken more, but if it were me in this situation, i would try to flash the factory KK firmware you used to downgrade with odin or however you did it. hopefully, that will clean everything up and let it boot properly.
if for whatever reason you cant do that, we could try extracting the factory file, and just flashing recovery and system, those should be the only things that got changed putting on twrp and cm normally.

Sorry, I have the serious proplem wtih my LG pad V400, I rooted it and using <LG Flash Tool 2014> with <V40010c_00.kdz> to downgrate the firmware but their is error then my LG pad stuck in fastboot menu as with just turn off, restart and restart bootloader. if i seclect one one them the tablet just logged again the fastboot menu
it stuck on the fastboot menu and i cannot do nay think with it. I can restart with factory restore mode but when select yes to restore, it will restart and log in fastboot menu again.
I downloaded adb and fastboot program and put in one folder <Minimal ADB and Fastboot> in C:\Program Files (x86)\Minimal ADB and Fastboot
I dont have recovery image so i download file <cm-13.0-20160421-NIGHTLY-v400-recovery.img> form your link to download TWRP file
move it to folder of fastboot programe and changed its name to <recovery.img>
I turn on the tablet and it waited at fastboot menu
when i run the command <fasboot flash recovery recovery.img> and they said some thing wrong like in picture
please help me

Encountered some sort of brick...

Not too long ago (Back in the fall) my Nexus stopped working properly.
I had it running Dirty Unicorn (9.6 I do believe), i was laying on the couch with my baby sister and i pulled my phone out, noticed it was turning off, so I figured I must have held the PWR button back accident or my sister did when she was jumping on me. I proceed to turn it back on, it's working fine. 3 mintues later, it reboots then powers off. I try to turn it on, it will load to boot animation then slow down and stop during boot animation after a few secs then turn off. I tried again, same. It got warm some, so I left it alone for a little bit since it did turn on and off a couple times, so that can explain the heat it had.
I came back to it, it turned on for a sec(Google Logo) then shut off. Wouldn't turn on again, I charged some, tried to turn on, same.
So, now, I can sometimes get it into TWRP, sometimes i have to try a few times to do so (sometimes it wont boot, so i unplug the battery, plug back in and boot into twrp)
Booting into OS just restarts it. TWRP will stay booted into, but sometimes will suddenly power off the phone. I've been able to finally get my files off(by using a flashdrive, had to sped 4 hours grabbing a few at a time before each power off)
I started to get it to stay in twrp longer, but if i touch certain parts, like system, data sometimes, and other folders, it will power off. I've tried to reinstall DU, but got some error during write before it powered off.
Is there anything I can do? I'm stuck using a Droid Turbo since my Nexus 6 needs the screen replaced, and its previous owner stripped 11/22 of the screws, so i need to get a small enough screw extractor (reverse thread bit) to be able to switch to the new screen I have laying on my desk, taunting me.
I'd love to get back to my Nexus and use my Turbo just for Vainglory like I used to.
I do have it BL unlocked & TWRP installed along with Root(kinda obvious)
I also have access to a desktop to run command to push files and such if needed to get a fix

Can u get into bootloader? Have u tried flashing stock?
Sent from my XT1526 using Tapatalk

soupysoup said:
Can u get into bootloader? Have u tried flashing stock?
Sent from my XT1526 using Tapatalk
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Click to collapse
I can get into bootloader, I've tried erasing system then install dirty unicorn and gapps, but it just gives an error for a second then powers off or just powers off when it attempted to install

xBØYxTØYx said:
I can get into bootloader, I've tried erasing system then install dirty unicorn and gapps, but it just gives an error for a second then powers off or just powers off when it attempted to install
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Click to collapse
OK try this from a terminal;
fastboot format system
fastboot reboot bootloader
fastboot format userdata
fastboot reboot bootloader
fastboot format cache
fastboot reboot bootloader
Download a factory image from google, extract the system, boot, and userdata imgs and flash them with fastboot like this
fastboot flash boot boot.IMG
fastboot reboot bootloader
fastboot flash system system.IMG
fastboot reboot bootloader
fastboot flash userdata
fastboot reboot system
See if that works and let me kno
Sent from my XT1526 using Tapatalk

soupysoup said:
OK try this from a terminal;
fastboot format system
fastboot reboot bootloader
fastboot format userdata
fastboot reboot bootloader
fastboot format cache
fastboot reboot bootloader
Download a factory image from google, extract the system, boot, and userdata imgs and flash them with fastboot like this
fastboot flash boot boot.IMG
fastboot reboot bootloader
fastboot flash system system.IMG
fastboot reboot bootloader
fastboot flash userdata
fastboot reboot system
See if that works and let me kno
Sent from my XT1526 using Tapatalk
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Click to collapse
I will once I get the chance, I got it to boot twice, but turned off each time after a little. Haven't been able to get it to boot for a couple hours now, so I'm gonna order a battery and swap them then see if I can get it to boot long enough to get rid of whatever the problem. While I wait on the battery, I'm gonna try to mess with my Note 2 that seems to not accept custom roms and just loops the boot animation when I tried two custom roms so far. Lol

Off topic but which note 2 do you have?
Possible power button issue with nexus 5?

Sounds like a power button issue. Many have had it. Search the forums for discussion about it.

Stupid me, tried Auto Root CF for Pixel and now it is bootlooping badly, No ADB

Okay, so I had been out of the flashing game for a while now, and recently got a Pixel 128Gb after using my trusty Nexus 6P, and I attempted to do Fastboot boot-to-root.img, which now has me stuck in a weird bootloop issue.
It boots, gives me the stupid can't be checked for corruption ****, gets to the white Google Screen, then there is a weird visual glitch, a blue line appears near the bottom of the screen, then the phone immediately reboots and does it all over again after doing a ramdump.
I can't even get into recovery to manually flash the stock image, as soon as I try to select RECOVERY it jumps to the boot screen where it tells me again that it cant be checked for corruption, and then starts the bootloop all over again.
ADB cant recognize it for whatever reason either. So now I'm probably not your average ****ed, I'm advanced ****ed.
Any body have any ideas?

boot-to-root is for Android O, you have to follow this guide

I had this same exact problem and I was able to fix it by reflashing the factory image. You said adb cannot recognize your device. But what about fastboot? If you reboot into the bootloader, connect to your PC, and execute "fastboot devices", does your device show? Download the latest factory image here. Extract it and execute flash-all.bat. Let me know if this helps.

You don't understand. When you attempt to reboot and go into recovery the manual way, the moment you select Recovery, the phone reboots and attempts to boot up, fails, performs write to ext4 ramdump, then loops over and over. ADB won't work because it wiped with the fastboot oem unlock which wiped the device, meaning no developer mode, which means no usb debugging.
Doesn't matter. Google is sending me a new one.
:/

jdkzombie said:
You don't understand. When you attempt to reboot and go into recovery the manual way, the moment you select Recovery, the phone reboots and attempts to boot up, fails, performs write to ext4 ramdump, then loops over and over. ADB won't work because it wiped with the fastboot oem unlock which wiped the device, meaning no developer mode, which means no usb debugging.
Doesn't matter. Google is sending me a new one.
:/
Click to expand...
Click to collapse
Fastboot and recovery are two different things. If you hold volume down + power it'll show you the bootloader screen (fastboot), this is where you'd usually select recovery. But if you stay on that screen, you can flash images to your phone. To fix your bootloop, download the boot.img from the stock ROM and use these commands in fastboot:
fastboot flash --slot _a boot boot.img
fastboot flash --slot _b boot boot.img
Then reboot normally.

falsh factory image inside the bootloader, don't need to go to recovery.

Step by Step
Thanks to previous experience with hacking devices (Android, Sony, etc.), patience and only allowing myself to freak out for a few seconds. A couple Google searches lead me to reflashing my Google Pixel 128GB and not sending it back to OEM.
So for the less patient I will break down the steps to do stop the bootlooping.
DON'T PANIC
Either hold down power until your phone turns completely off or wait for the bootlooping to do it for you. It usually only loops a few times before powering down.
Hold Power + Volume Down until it boots into the Fastboot mode.
[This is the screen that says you Phone Stats (serial #, cpu, ram, etc.) and has an Android picture on it laying down.]
Connect your Phone to your computer using a USB 3.0 port.
[My PC wouldn't recognize my phone at all when connected to USB 2.0]
Download from Full Factory Image from Google. { https://developers.google.com/android/images }
[Mine was "7.1.2 (N2G47O, May 2017)" for my Project Fi 128GB Pixel, but make sure you get the one for your phone]
Navigate to where your SDK/Fastboot folder is on your PC
[Unless you moved it, it is usually "C:\Users\USERNAME\AppData\Local\Android\Sdk" by default.]
Unzip the Contents of your Full Factory Image zip file to this location in it's own directory (for cleanliness).
Open a Command Prompt with a Right-Click "Run as Administrator" and navigate you your new zip file's directory.
["\platform-tools\sailfish-n2g47o" or whatever version of the Full Factory Image you used was.]
Type in "flash-all.bat" and wait for your phone to finish its installation. Your phone will restart itself into Fastboot Mode many times during this process.
Once it is finished, you phone should boot into its normal "First Boot Sequence" like you just started it up for the very first time.
At this point you can try flashing something else or use a different technique to update your recovery mode or ROM.
Good Luck.

Pixel 2 Magisk Bug won't take pin

Pixel 2 XL is soft bricked at the moment and I can't for the life of me think of what I need to do to recover it. I unlocked my bootloader and rooted when I switched to Pie, (I saw people we're already able to use Android pay on a rooted device again and I just couldn't help myself.) I installed twrp accidentally tried to flash TWRP not realizing I needed to temporary boot it and pushing the zip over erasing the recovery I proceeded to just fastboot it and carry on with the normal procedure with my phone. after getting Magisk installed I had my phone all set up until the next time I turned it on and back off again It said I forgot my PIN which I know I didn't I think this was because a glitch with smartlock I just setup so I go to my recovery and wipe the Dalvik cache, cache, Internal storage, and data and low and behold my phone bootloops never making past the final stage before it gets to the lockscreen. I go to Fastboot screen on my phone and my mac can't list my phone as a device in adb and now I am having issues getting back into recovery which I think might be because I am on the stock kernel my Fastboot screen on my phone says Product Name - Taimen, Variant - MSM USF:SAMSUNG(64gig) DDR:SAMSUNG, Bootloader version - TM220j, Baseband version - g899800253-1805232234, my Serial number, Serure boot - Yes, Device status - Unlocked, Vart console - Disabled, HW version - rev_10
I can't get it to stop bootlooping and just turn off.

bump

xda Zed said:
bump
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Try flashing the stock boot.img with Fastboot. That might get you out of it. Since you did all the wiping I can't say for sure. However, when you were at the point where it wouldn't take your password, that's all that needed to be done. I ran into the same thing. It's a Magisk bug. Magisk gets flashed to the boot partition so flashing the factory boot.img will fix it. TWRP also gets flashed to the boot partition so if you flashed it too, flashing a factory boot image will get rid of that too. ADB won't see the phone while it's in fastboot mode. You need to use "fastboot devices". You can download a factory image if you don't have one and extract the boot.img from it. Put it in the folder your fastboot is in, and then open a command prompt (terminal? I'm not a MAC person) from that folder and type "fastboot flash boot boot.img" (without the quotes). Make sure you use download the factory image that's the same as what you currently have installed on the phone.

robocuff said:
Try flashing the stock boot.img with Fastboot. That might get you out of it. Since you did all the wiping I can't say for sure. However, when you were at the point where it wouldn't take your password, that's all that needed to be done. I ran into the same thing. It's a Magisk bug. Magisk gets flashed to the boot partition so flashing the factory boot.img will fix it. TWRP also gets flashed to the boot partition so if you flashed it too, flashing a factory boot image will get rid of that too. ADB won't see the phone while it's in fastboot mode. You need to use "fastboot devices". You can download a factory image if you don't have one and extract the boot.img from it. Put it in the folder your fastboot is in, and then open a command prompt (terminal? I'm not a MAC person) from that folder and type "fastboot flash boot boot.img" (without the quotes). Make sure you use download the factory image that's the same as what you currently have installed on the phone.
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Click to collapse
I stopped my endless bootloop! Now it says my device is corrupt and cannot be trusted and may not work properly when I tried to start it I couldn't get past the google screen. When I plug it into charge now it doesn't automatically going into a bootloop that can only be stoped by going into the fastboot mode or running out of battery, but the the charging symbol on the screen won't go away. I might have wiped system when I was in TWRP when I couldn't boot back after the first wipe. And I accidentally tried fastbooting Telstra img first. Anyway to get past this white Google screen? Also when I trey to go to recovery now it's the android laying on it's back with a red triangle and it says no command. Should I execute the flash-all script?

Downloaded the stock img files and ran the flash all .sh and now I am back in Android ready to mess something up again I could not thank you enough for your help I am so happy right now

xda Zed said:
Downloaded the stock img files and ran the flash all .sh and now I am back in Android ready to mess something up again I could not thank you enough for your help I am so happy right now
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Click to collapse
Glad to hear you got it working again. As for the recovery screen that say no command, that't the way it works with the stock recovery. When you see that screen, press and hold power and volume up. That will get you into recovery. If you happen to try rooting again and get stuck in a bootloop or some such thing, just flash the stock boot image.. That should get you going again.

Cannot revive my phone

My note 6 pro suddenly started doing boot loop. I tried to revive it by flashing stock firmware but nothing seems to help. It has unlocked bootloader, with TWRP installed. This is what I tried:
Put phone in fastboot mode, I do see the fastboot image.
Computer recognizes the phone. 'fastboot devices' shows correct device.
Using MI Flash tool to flash 10.3.6 global fastboot image. It takes about 160 seconds to flash all the partitions. The phone will reboot at the the end of the flash. Flash tool doesn't say "successful" though. Its status is still "flashing".
No other errors. When the phone restarts, it is still stuck in the boot loop. Interesting thing is, if I press volume + button and power button, I see TWRP flash for a quick second on the screen then boot again. Looks like the recovery image wasn't flashed properly.
Looked at the logs. Nothing strange. Also tried to run 'flash-all.bat' in a command line (not sure if we are supposed to do that), but all the fastboot flash commands look OK.
Anything else I can do to revive this phone?