Develop Bugs

Someone, please help me! :(

When I boot up my tablet, I get nonstop error messages telling me things have stopped working. I tried getting help from someone else on a different site, and this is what they told me to say: I flashed the GROUPER lollipop ROM onto a FLO. Someone please help me!!! It's a totally clean tablet. no files on it except android.

Go to Google's Nexus firmware page, download the appropriate firmware, follow the instructions: https://developers.google.com/android/nexus/images
Only thing I don't know is whether or not you'll have to repartition the internal flash.

I'm a dummy.
nhizzat said:
Go to Google's Nexus firmware page, download the appropriate firmware, follow the instructions:
Only thing I don't know is whether or not you'll have to repartition the internal flash.
Click to expand...
Click to collapse
i don't understand how to do all that though I'm not good with command prompts... and nexus root tool kit has done me no good. Could you dumb down the instructions for me?

Then it's time for you to learn. The page has step-by-step instructions. There isn't any way too dumb down the instructions.
You have to start somewhere. Now is a good time. If you had learned before, you wouldn't be in this predicament.
So sit down, take a couple deep breaths, then read the instructions a few times. Download the Android SDK and factory image, then get everything set up. Don't panic, it's not nearly as difficult as you're making it out to be. Stop psyching yourself out. Take it step by step. If you get stuck, leave the cmd prompt and post the issue you've run into here.
Might help if you type out the instructions here after you've read them over several times. I'm glad to help but you gotta take ownership of your tablet and put in some effort to learn and educate yourself.
Just try, I'm sure you'll understand it by the end of tonight or the end of the weekend. You don't have to be a master of fastboot and adb, I sure as hell am not. I never recommend the use of toolkits, especially by those with no understanding of fastboot and adb. Once you have a basic understanding of fastboot and adb, go ahead and use any toolkit you want because by then you'll know how to get yourself out of any jams using those 2 tools.

It is almost impossible to hard brick this device, even if you flash the wrong ROM on this device..
Download this utility and it will bring your Nexus back to life....
http://www.wugfresh.com/nrt/

Giving up
nhizzat said:
Then it's time for you to learn. The page has step-by-step instructions. There isn't any way too dumb down the instructions.
You have to start somewhere. Now is a good time. If you had learned before, you wouldn't be in this predicament.
So sit down, take a couple deep breaths, then read the instructions a few times. Download the Android SDK and factory image, then get everything set up. Don't panic, it's not nearly as difficult as you're making it out to be. Stop psyching yourself out. Take it step by step. If you get stuck, leave the cmd prompt and post the issue you've run into here.
Might help if you type out the instructions here after you've read them over several times. I'm glad to help but you gotta take ownership of your tablet and put in some effort to learn and educate yourself.
Just try, I'm sure you'll understand it by the end of tonight or the end of the weekend. You don't have to be a master of fastboot and adb, I sure as hell am not. I never recommend the use of toolkits, especially by those with no understanding of fastboot and adb. Once you have a basic understanding of fastboot and adb, go ahead and use any toolkit you want because by then you'll know how to get yourself out of any jams using those 2 tools.
Click to expand...
Click to collapse
I'm officially giving up. Nothing works. It boots into the OS and then pops up a bunch of error messages. I've tried lollipop, kitkat, cyanogenmod, locked bootloader, unlocked bootloader, and I'm done. GR! Thank you though, for your help.

Boucherwayne78 said:
I'm officially giving up. Nothing works. It boots into the OS and then pops up a bunch of error messages. I've tried lollipop, kitkat, cyanogenmod, locked bootloader, unlocked bootloader, and I'm done. GR! Thank you though, for your help.
Click to expand...
Click to collapse
So that means you will sell it to me for $20?

Boucherwayne78 said:
I'm officially giving up. Nothing works. It boots into the OS and then pops up a bunch of error messages. I've tried lollipop, kitkat, cyanogenmod, locked bootloader, unlocked bootloader, and I'm done. GR! Thank you though, for your help.
Click to expand...
Click to collapse
Nothing works? Just flash the factory image. Flashing Roms in recovery isn't going to help you. Before you give up, just use wugs toolkit to save it. If you give up without even trying the right procedure (fastboot flash factory image) then i recommend you not root again after you fix it. But wugfresh toolkit will fix it for you with a couple clicks.

I tried NRTK
madbat99 said:
Nothing works? Just flash the factory image. Flashing Roms in recovery isn't going to help you. Before you give up, just use wugs toolkit to save it. If you give up without even trying the right procedure (fastboot flash factory image) then i recommend you not root again after you fix it. But wugfresh toolkit will fix it for you with a couple clicks.
Click to expand...
Click to collapse
The toolkit doesn't work. I tried that 9 times, both downloading my own OS to flash, and letting the toolkit download it. Every time it either boot loops it or does the error message spam thing again. That's why I was trying to use SDK... And that didn't work either. And my drivers NEVER INSTALL RIGHT, so it's all just slowly killing me inside...

Make sure fastboots working first. Put the tablet in bootloader mode by shutting it off then holding power and volume down (or up I forget, you want the screen that says start at the top and has device info at the bottom left.)
Connect to computer then go into the platform-tools folder in the SDK folder, hold shift and right click over the window>open command prompt here.
Type fastboot devices and hit enter. Does it show a serial number or does it show nothing? (waiting for device or something like that) If nothing you should uninstall all drivers for the tablet in device manager and install the google usb driver from the sdk manager in the sdk you installed.
Once you see the serial number you're almost done. If your bootloader is locked type fastboot oem unlock
Now from the factory image copy the image-razor.zip, bootloader.img and flash-all.bat to the platform-tools folder.
Double click flash-all.bat
That's it.

I think that it will be beneficial for you to look into using virtual machines (VM's). It allows you to run different operating systems directly from your computer.
The second half to this equation is learning to use Linux (Ubuntu is my choice). Since Android is built from Linux, you don't need special drivers to recognize your devices.
Another option to run Ubuntu is to create a Virtual Hard Drive on your PC, and install Ubuntu onto it (YouTube it, and follow the directions carefully).
Lastly, you can always get a flash drive that is 8gb or greater (16gb or 32gb is recommended), and install Ubuntu onto it was well. It will move little slower than your PC, but your issues will be solved and manageable.
Why am I advocating for Ubuntu? Because it works. PM me if your are interested in learning more, but don't expect me to do all of the work. You need to educate yourself a bit to actually follow my instructions.
____________________________
Please remember to:
Check Q & A forums before asking!
Search forum for similar post before creating!
Hit "thanks" to everyone who may have helped you (it costs nothing)!
Read the OP!!!!

Boucherwayne78 said:
The toolkit doesn't work. I tried that 9 times, both downloading my own OS to flash, and letting the toolkit download it. Every time it either boot loops it or does the error message spam thing again. That's why I was trying to use SDK... And that didn't work either. And my drivers NEVER INSTALL RIGHT, so it's all just slowly killing me inside...
Click to expand...
Click to collapse
First off, let me explain that this device is almost impossible to destroy by flashing the wrong rom. Your over reacting due to inexperience, your Nexus is fine as long as you can boot into Fastboot. When the device is powered down, press the power button and the Volume down key for about 30 seconds, if you can boot into Fastboot, your device is just fine.. Nexus devices are extremely hard to hard brick.. RELAX and realize this is a good time to learn something new, this device is the perfect device to experiment with... You seem to not have the patients and you just need to relax watch a few youtube videos.. No one is going to do it for you.. About 5 years ago I was in the same place you are right now, and I took the time to figure how to fix what ever I did to mess it up.. Its not hard once you realize what your doing. The Toolkit is a swiss army knife of tools that can fix, repair and flash stock roms. Did you unlock the bootloader? Take a breather, give it some time and figure it out like we all did at one time or another, none of us here had our hands held during the learning process with Android devices..
Edit: I'm almost sure you did not unlock your device, to know for sure if your device is unlocked you would see a small padlock that appears to be in the unlocked position at the bottom of your screen while powering on.. If you power your Nexus on, and you DO NOT see a unlocked symbol at the bottom of your screen, you DID NOT unlock your device, thus meaning you have to unlock it to flash it properly.. There are dozens of people in this forum right now that would be more than happy to buy your device cheap and fix it themselves.. If they can do it, you can too..

^Yeah like my last post, those are perfectly fine instructions. If that don't work, stuck at "erasing user data" or something you're ****ed. Most likely.Try a different cord/usb 2.0/computer

Tried a few things. Got any other ideas?
Zaphodspeaks said:
First off, let me explain that this device is almost impossible to destroy by flashing the wrong rom. Your over reacting due to inexperience, your Nexus is fine as long as you can boot into Fastboot. When the device is powered down, press the power button and the Volume down key for about 30 seconds, if you can boot into Fastboot, your device is just fine.. Nexus devices are extremely hard to hard brick.. RELAX and realize this is a good time to learn something new, this device is the perfect device to experiment with... You seem to not have the patients and you just need to relax watch a few youtube videos.. No one is going to do it for you.. About 5 years ago I was in the same place you are right now, and I took the time to figure how to fix what ever I did to mess it up.. Its not hard once you realize what your doing. The Toolkit is a swiss army knife of tools that can fix, repair and flash stock roms. Did you unlock the bootloader? Take a breather, give it some time and figure it out like we all did at one time or another, none of us here had our hands held during the learning process with Android devices..
Edit: I'm almost sure you did not unlock your device, to know for sure if your device is unlocked you would see a small padlock that appears to be in the unlocked position at the bottom of your screen while powering on.. If you power your Nexus on, and you DO NOT see a unlocked symbol at the bottom of your screen, you DID NOT unlock your device, thus meaning you have to unlock it to flash it properly.. There are dozens of people in this forum right now that would be more than happy to buy your device cheap and fix it themselves.. If they can do it, you can too..
Click to expand...
Click to collapse
Thank you for your reply. Do you have any suggestions though for my situation? My bootloader was unlocked. I did try locking it then unlocking it several times though. I've tried two seperate stock ROMs, different usb cables, different usb ports, and it now tells me that fastboot is not working. even a link is greatly appreciated. I think it is a driver problem. My tablet does boot into the OS though. I can use the ui for about 10 seconds, then a notification pops up mid-screen: "unfortunately, the process android.process.acore has stopped." Please, even a link is greatly appreciated. I've tried just about everything to get these drivers working, and to get this tablet working. I will continue to research as well. Wish me luck!

Wug's tool has been invaluable to me in the past. I have gone from KitKat to Lollipop, back and forth, different ROMS, stuck boots, bad flashes. Like Zap says if you can get it to Bootloader then get Wug's tool to connect in fastboot, it will do the rest.
A couple times I have ran into problems where my computer has not seen my Nexus 5 because of the drivers, just google nexus usb drivers and install the latest ones.

azsgolf said:
Wug's tool has been invaluable to me in the past. I have gone from KitKat to Lollipop, back and forth, different ROMS, stuck boots, bad flashes. Like Zap says if you can get it to Bootloader then get Wug's tool to connect in fastboot, it will do the rest.
A couple times I have ran into problems where my computer has not seen my Nexus 5 because of the drivers, just google nexus usb drivers and install the latest ones.
Click to expand...
Click to collapse
Got any ideas on Fastboot.exe stopping working when the flash process begins? it fails sending bootloader and then fastboot.exe fails. It says on the screen when i close the error message it's booting into bootloader, but the tablet never restarts. it stays on bootloader(where i had it in the first place.) It should turn off the screen and go back into bootloader. Please, any feedback is appreciated.

Have you tried selecting the option of hardbrick on the tool?

G4 Completely Bricked, help needed

Hi all,
After installing some OTA on a stock G4, the phone has itself stuck in a bootloop, where i get a screen: "Security Error, authentication fail #9". I can get to the recovery, where the only option is erase all, but even selecting that goes straight back to the error.
I was hoping i could use fastboot to reset it, but no PC i plug it into (windows and linux) is picking up the device. As in, my windows device manager doesn't even see something new plugged in, and linux lsusb doesn't see a device either, so of course fastboot isn't working. Any ideas? I've done much googling, but couldn't find anyone with the complete set of circumstances i have. I'd prefer to not have to send it back
Cheers,
David

did you root it?
if not, I highly suggest you to send it back than fixing it yourself, as the development of G4 is not yet matured and this *could* be a hardware problem, IMHO.

dgoemans said:
Hi all,
After installing some OTA on a stock G4, the phone has itself stuck in a bootloop, where i get a screen: "Security Error, authentication fail #9". I can get to the recovery, where the only option is erase all, but even selecting that goes straight back to the error.
I was hoping i could use fastboot to reset it, but no PC i plug it into (windows and linux) is picking up the device. As in, my windows device manager doesn't even see something new plugged in, and linux lsusb doesn't see a device either, so of course fastboot isn't working. Any ideas? I've done much googling, but couldn't find anyone with the complete set of circumstances i have. I'd prefer to not have to send it back
Cheers,
David
Click to expand...
Click to collapse
You don't say which model you have, whether you are rooted with a custom recovery, etc. If you WERE rooted with a custom recovery and you took an OTA (intentional or not) you could be screwed until/unless someone finds a way to address it.
...my$.02

you said Stock G4, have you had another countries rom on it and tried to return back to stock, what model is it ie H815....

dgoemans said:
Hi all,
After installing some OTA on a stock G4, the phone has itself stuck in a bootloop, where i get a screen: "Security Error, authentication fail #9". I can get to the recovery, where the only option is erase all, but even selecting that goes straight back to the error.
I was hoping i could use fastboot to reset it, but no PC i plug it into (windows and linux) is picking up the device. As in, my windows device manager doesn't even see something new plugged in, and linux lsusb doesn't see a device either, so of course fastboot isn't working. Any ideas? I've done much googling, but couldn't find anyone with the complete set of circumstances i have. I'd prefer to not have to send it back
Cheers,
David
Click to expand...
Click to collapse
Send the 815 model back
BAD ASS NOTE 4

If you didn't do a full nandroid backup before trying to update, then it's kind of on you

Strange somebody seeking urgent help, and vanished after writing incomplete details. People, pls forget about this thread.

r4Rok said:
Strange somebody seeking urgent help, and vanished after writing incomplete details. People, pls forget about this thread.
Click to expand...
Click to collapse
Yeah I have never understood why some people post mini-rants about needing help so bad but ALWAYS leave the details as murky as possible, logically speaking it just never adds up.

I think you can probably restore via KDZ. Check the appropriate thread and try.
At least you aren't stuck in Qualcomm 9008 like I am, where you have to wait for some kind of LG-only tool to be leaked to restore it.

duraaraa said:
I think you can probably restore via KDZ. Check the appropriate thread and try.
At least you aren't stuck in Qualcomm 9008 like I am, where you have to wait for some kind of LG-only tool to be leaked to restore it.
Click to expand...
Click to collapse
May I ask how you managed to do this and what were you attempting to do when this happened??

Bricked 5T - locked recovery

Hi im having a hard time figuring this out, this is a brand new 5t that bricked itself while ota updating
the device is in a boot loop (wont go any further than the oneplus logo)
if i enter to the recovery it says LOCKED, and the oem unlock option on android is not enabled
im in argentina so i cant send the phone to oneplus rma
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
is there any way to unlock the bootloader? then i would be able to flash it and save the phone
Ps: a level 2 OnePlus tech guy tried a remote fix with the official brand software and it did not work

https://forum.xda-developers.com/oneplus-5t/how-to/oneplus-5t-unbricking-tool-confirmation-t3733012
Hope that helps. If you can get it to load in that mode, it'll fix about anything.

es0tericcha0s said:
https://forum.xda-developers.com/oneplus-5t/how-to/oneplus-5t-unbricking-tool-confirmation-t3733012
Hope that helps. If you can get it to load in that mode, it'll fix about anything.
Click to expand...
Click to collapse
Thanks a lot! i think that oneplus did use that file and did not work but i will try it again (at least 10 times)

I think it might be tricky to get it into the QHUSB mode unless it's hard bricked. I've fixed a 3t like that but luckily haven't had issues on the 5t yet. I think the only way might be via test point (which would require some hardware work that's not recommended for beginners). Thinking about it now, this might not have been the best solution to provide for your particular issue.
Just thought about this after re-reading your post. When you say that you booted into Recovery and it says locked but you posted a picture of the Fastboot screen showing just that the bootloader is locked - which is to be expected unless you went through the bootloader unlock process.
What happens when you actually boot to recovery? Have you tried factory resetting it there? I imagine the remote desk guy might have tried to adb sideload the update?

This is why I wish we had a fastboot OEM image install option like Google provides.
Maybe we do though and I just haven't found it yet.
Haven't looked very hard.

es0tericcha0s said:
I think it might be tricky to get it into the QHUSB mode unless it's hard bricked. I've fixed a 3t like that but luckily haven't had issues on the 5t yet. I think the only way might be via test point (which would require some hardware work that's not recommended for beginners). Thinking about it now, this might not have been the best solution to provide for your particular issue.
Just thought about this after re-reading your post. When you say that you booted into Recovery and it says locked but you posted a picture of the Fastboot screen showing just that the bootloader is locked - which is to be expected unless you went through the bootloader unlock process.
What happens when you actually boot to recovery? Have you tried factory resetting it there? I imagine the remote desk guy might have tried to adb sideload the update?
Click to expand...
Click to collapse
if i boot to recovery and press the power button to select factory reset or any usefull option, the phone resets, i think that the problem is a corrupt recovery, thats why i want to unlock it, install TWRP and then try to flash android

CZ Eddie said:
This is why I wish we had a fastboot OEM image install option like Google provides.
Maybe we do though and I just haven't found it yet.
Haven't looked very hard.
Click to expand...
Click to collapse
maybe this is an anti thief security measure? (since android 6.0 )

es0tericcha0s said:
I think it might be tricky to get it into the QHUSB mode unless it's hard bricked. I've fixed a 3t like that but luckily haven't had issues on the 5t yet. I think the only way might be via test point (which would require some hardware work that's not recommended for beginners). Thinking about it now, this might not have been the best solution to provide for your particular issue.
Just thought about this after re-reading your post. When you say that you booted into Recovery and it says locked but you posted a picture of the Fastboot screen showing just that the bootloader is locked - which is to be expected unless you went through the bootloader unlock process.
What happens when you actually boot to recovery? Have you tried factory resetting it there? I imagine the remote desk guy might have tried to adb sideload the update?
Click to expand...
Click to collapse
why would i have a problem putting the 5t on qhusb? i did not know that it could be done via testpoint
the phone works, the problem seems to be a faulty file on the bootloader or maybe an internal damage from factory (i hope this is not the case)
in a few hours i will try it all and post the result

Typically a phone will only go into the Qualcomm QHUSB mode when it's hard bricked. You're only soft bricked. What happens when you actually get into Recovery?

es0tericcha0s said:
Typically a phone will only go into the Qualcomm QHUSB mode when it's hard bricked. You're only soft bricked. What happens when you actually get into Recovery?
Click to expand...
Click to collapse
I did the entire process and the result is the same as before doing it, the phone turns on and gets stuck on the oneplus logo, it does nothing else, the recovery works but doesnt do anything usefull

Do you get any errors when performing a factory reset? As in a partition not mounting? Since your baseband doesn't show in the fastboot mode, I'm thinking maybe an /efs error. If you got it new, I'd talk to 1+ about an RMA since this was caused by an official update and one of their technicians already failed to fix it.

es0tericcha0s said:
Do you get any errors when performing a factory reset? As in a partition not mounting? Since your baseband doesn't show in the fastboot mode, I'm thinking maybe an /efs error. If you got it new, I'd talk to 1+ about an RMA since this was caused by an official update and one of their technicians already failed to fix it.
Click to expand...
Click to collapse
It may well be a partition error, one+ is not being helpfull right now
I did comit an error saying that the recovery works, it doesnt work, the pone only goes into fastboot and qhusb mode, after that it will allways get stuck on the oneplus logo
On adb i get feedback if i try to flash the phone says "not allowed, locked device"
I think that the problem is a corrupt bootloader
The msmdownloader tool works, i dont know what It copies on to the terminal but i want to flash the recovery and bootloader using that tool, i dont know if it is possible

this the md5sum file that i found in a compilation for oneplusone (msmdownloader tool)
so i shoud be able to do the same with the 5t

es0tericcha0s said:
Typically a phone will only go into the Qualcomm QHUSB mode when it's hard bricked. You're only soft bricked. What happens when you actually get into Recovery?
Click to expand...
Click to collapse
that is no true, u just have the phone powered off and then hold the volume + and plug the device in, if u saw the video in the unbrick post he was not bricked at all and everything was working good and still did a restore, not sure why it is not working for the OP but it should fix it.

Yes i can enter into qhusb, and i can flash the phone with msm downloader, but i used the origibal file that oneplus technicians use amd it didnt work, now i want to flash hydrogen os or the recovery file only into the terminal but i dont know how to modify the msm downloader (the unbrick tool)

Had the same error message tonight after spontaneous reboot of my (unmodified and locked) device. Fortunately, reimaging with stock ROM from downloads.oneplus.net via adb sideload worked for me, without losing any data. Tried that?

sascha224 said:
Had the same error message tonight after spontaneous reboot of my (unmodified and locked) device. Fortunately, reimaging with stock ROM from downloads.oneplus.net via adb sideload worked for me, without losing any data. Tried that?
Click to expand...
Click to collapse
I remember that the device wouldnt flash anything because it was locked, but I will try the sideload right away

It has been impossible to fix, this is the best i got doing fastboot boot recovery.img

Trouble rooting tmobile g4- phone disappeared from devices after OEM unlock

I found the guide to unlock downgrade and root 20i, but since i was already on 20i i figured id just skip to the unlock part.
ADB connected.
Got the oem unlock to work flawlessly, tried to boot TWRP, and it said file sent, cannot boot, file unsigned (or something similiar, can copy paste the actual text when i get off work tonight)
I got annoyed and just booted the phone normally and it worked fine and is unlocked-
But cant get the phone to show up on adb again.
Maybe try the universal drivers? Seems to hang on the drivers- the laptop has them installed but the phone doesnt know that they are and keeps asking me to reinstall (which doesnt work)
Any ideas?
Should i start over,upgrade the stock rom and then downgrade, like the directions actually say?

redchigh said:
I found the guide to unlock downgrade and root 20i, but since i was already on 20i i figured id just skip to the unlock part.
ADB connected.
Got the oem unlock to work flawlessly, tried to boot TWRP, and it said file sent, cannot boot, file unsigned (or something similiar, can copy paste the actual text when i get off work tonight)
I got annoyed and just booted the phone normally and it worked fine and is unlocked-
But cant get the phone to show up on adb again.
Maybe try the universal drivers? Seems to hang on the drivers- the laptop has them installed but the phone doesnt know that they are and keeps asking me to reinstall (which doesnt work)
Any ideas?
Should i start over,upgrade the stock rom and then downgrade, like the directions actually say?
Click to expand...
Click to collapse
The LG driver you've installed on your laptop is most likely no longer functional for the phone. If it shows in Device Manager when you're trying to connect it, uninstall it (mine didn't work either after unlocking/using FWUL, or something else, for whatever reason).
Once the current driver is uninstalled, turn off your computer, plug your phone in with the USB cable and then turn on the computer and let Windows install the driver now (It worked on mine).
See the attachment below for a screenshot of the current driver for my LG G4 that is working completely.

I got it to show up, but I've realised I have the motherboard issue common to G4's.
The phone hangs at 'bootloader unlocked' lg screen.
Hope the seller will give me a refund or exchange.

redchigh said:
I got it to show up, but I've realised I have the motherboard issue common to G4's.
The phone hangs at 'bootloader unlocked' lg screen.
Hope the seller will give me a refund or exchange.
Click to expand...
Click to collapse
It may just be a 'soft brick' you've encountered, in which case you should be able to it overcome relatively easily. First thing to try, is just unplug the phone and take out the battery. Put the battery back in and see if it will boot up. If not, see if you can get into Download mode and flash your rom version for your phone model with LGUP-NEW.
With respect to TWRP, if you can get into bootloader/fastboot mode, refer to this thread: https://forum.xda-developers.com/g4/development/recovery-twrp-3-touch-recovery-t3442424 and follow the instructions to flash by fastboot commands. Use the latest preview version for your rom version, i.e., MM, N or O.
Note: The Thanks button at the bottom right of the post should be used when members are trying to help you with your issues. It's an XDA courtesy, so please learn to use it.

sdembiske said:
It may just be a 'soft brick' you've encountered, in which case you should be able to it overcome relatively easily. First thing to try, is just unplug the phone and take out the battery. Put the battery back in and see if it will boot up. If not, see if you can get into Download mode and flash your rom version for your phone model with LGUP-NEW.
With respect to TWRP, if you can get into bootloader/fastboot mode, refer to this thread: https://forum.xda-developers.com/g4/development/recovery-twrp-3-touch-recovery-t3442424 and follow the instructions to flash by fastboot commands. Use the latest preview version for your rom version, i.e., MM, N or O.
Click to expand...
Click to collapse
Thanks for the tip. I already tried ADB (wouldn't boot reliably), LG UP (completes successfully- the phone, when LG UP sends the reboot at 75% or so, just hangs on the LG screen forever (though LG UP says it was successful). I also have LG Bridge, but haven't reached any level of success with it either. Luckily all these bookmarks will come in super handy with my replacement.
(Also the day it broke, somehow the camera activated in my pocket. I detected the warmth, but working an assembly line, under a cameras watch, I couldn't pull it out and fix it quickly.
sdembiske said:
Note: The Thanks button at the bottom right of the post should be used when members are trying to help you with your issues. It's an XDA courtesy, so please learn to use it.
Click to expand...
Click to collapse
Thanks for the reminder, I'll try to remember.

redchigh said:
Thanks for the tip. I already tried ADB (wouldn't boot reliably), LG UP (completes successfully- the phone, when LG UP sends the reboot at 75% or so, just hangs on the LG screen forever (though LG UP says it was successful). I also have LG Bridge, but haven't reached any level of success with it either. Luckily all these bookmarks will come in super handy with my replacement.
(Also the day it broke, somehow the camera activated in my pocket. I detected the warmth, but working an assembly line, under a cameras watch, I couldn't pull it out and fix it quickly.
Thanks for the reminder, I'll try to remember.
Click to expand...
Click to collapse
OK - one last thing to try if you want to try it. Using the power and volume keys, see if you can get into Recovery mode to do a hard factory reset
- refer to this link for the how-to for entering Recovery mode: https://www.androidexplained.com/lg-g4-recovery-mode/

Pixel 3 XL Can't find Valid Operating System

Hi
"Can't find valid operating system. The device will not start."
Then shows the visit g.co/ABH link.
I am not even able to boot into recovery. When selecting recovery from fastboot mode it just goes right to the same "Can't find valid operating system..." screen.
Device State: Locked
Developer Mode : Not Enabled and not possible to do now
PLease help me. As i am from Nepal , there is nothing i can't claim for warranty.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

senbros said:
Hi
"Can't find valid operating system. The device will not start."
Then shows the visit g.co/ABH link.
I am not even able to boot into recovery. When selecting recovery from fastboot mode it just goes right to the same "Can't find valid operating system..." screen.
Device State: Locked
Click to expand...
Click to collapse
Sorry, but with no working recovery and a locked bootloader you are dead in the water. There is nothing that can be done.

Are you able to unlock your bootloader? Might be able to download the factory image do it that way. Fastboot flashing unlock it something. Then run the flash all.bat from the factory image once you download it and unzipped it.

mammothjojo88 said:
Are you able to unlock your bootloader? Might be able to download the factory image do it that way. Fastboot flashing unlock it something. Then run the flash all.bat from the factory image once you download it and unzipped it.
Click to expand...
Click to collapse
I tried nothing works to unlock bootloader.. Still looking for solution..
Thank you for your time

Can't find valid operating system
senbros said:
Hi
"Can't find valid operating system. The device will not start."
Then shows the visit g.co/ABH link.
I am not even able to boot into recovery. When selecting recovery from fastboot mode it just goes right to the same "Can't find valid operating system..." screen.
Device State: Locked
Developer Mode : Not Enabled and not possible to do now
PLease help me. As i am from Nepal , there is nothing i can't claim for warranty.
Click to expand...
Click to collapse
Hi Mate,
I had the same thing happen Last Friday morning. I was just applying an OTA update, then when phone rebooted I got the same message on my Pixel 3 ( 2 weeks old ). I spent many hours over the weekend trying to figure out how to get a factory image on it. However without unlocking the bootloader ( which is not possible ), also having the recovery also corrupted, there is nothing we can do, except send it to a friend or someone we know and trust to get the phone repaired or if its under warranty still, possibly replaced by google. Sorry to be the giver of bad news. These are now expensive paper weights. It seems it becoming more common.

This is happening for more pixels. Google is must fix it remotely or pixel 4 might fail on landing.

issue resolved by google support
Hi,
i am having same issue with my pixel 3 last week, so i called Indian google service center ( 1800-419-0655 ) they pick up my phone from my place and resolve the issue.
so i will suggest you to visit/call google support team so they will resolve you issue.
---------- Post added at 06:03 AM ---------- Previous post was at 05:59 AM ----------
slysurfer said:
Hi Mate,
I had the same thing happen Last Friday morning. I was just applying an OTA update, then when phone rebooted I got the same message on my Pixel 3 ( 2 weeks old ). I spent many hours over the weekend trying to figure out how to get a factory image on it. However without unlocking the bootloader ( which is not possible ), also having the recovery also corrupted, there is nothing we can do, except send it to a friend or someone we know and trust to get the phone repaired or if its under warranty still, possibly replaced by google. Sorry to be the giver of bad news. These are now expensive paper weights. It seems it becoming more common.
Click to expand...
Click to collapse
hi there,
i had same issue last week, so i called google support. they pick up my pixel from my place and resolve the issue.
so please do the same contact google support. they will help you.

Problem in Pixel 3
They gave you a replacement or repaired the original device?? And how many days B2X took from pickup to delivering it back??
tailorhardik94 said:
Hi,
i am having same issue with my pixel 3 last week, so i called Indian google service center ( 1800-419-0655 ) they pick up my phone from my place and resolve the issue.
so i will suggest you to visit/call google support team so they will resolve you issue.
---------- Post added at 06:03 AM ---------- Previous post was at 05:59 AM ----------
hi there,
i had same issue last week, so i called google support. they pick up my pixel from my place and resolve the issue.
so please do the same contact google support. they will help you.
Click to expand...
Click to collapse

Not sure if anyone still needs help with this, but I just ran into this issue on my Pixel 4 XL and I held down the volume down button and power button to reboot into fastboot. From there you can connect to a PC and flash images or unlock/lock bootloader, etc.
From there I was able to use the flash.android.com site and flash the latest OTA to my phone and now I'm back up and running.
Hope this helps someone down the road.

bradwatson said:
Not sure if anyone still needs help with this, but I just ran into this issue on my Pixel 4 XL and I held down the volume down button and power button to reboot into fastboot. From there you can connect to a PC and flash images or unlock/lock bootloader, etc.
From there I was able to use the flash.android.com site and flash the latest OTA to my phone and now I'm back up and running.
Hope this helps someone down the road.
Click to expand...
Click to collapse
You can't do anything if you come across this problem whilst your bootloader is locked. I had a Pixel 3, applied ota via recovery and I got that error message. Couldn't do anything, flash factory image etc due to locked bootloader and recovery being corrupted.
Quite simply if it's under warranty, contact google.

kartikb said:
You can't do anything if you come across this problem whilst your bootloader is locked. I had a Pixel 3, applied ota via recovery and I got that error message. Couldn't do anything, flash factory image etc due to locked bootloader and recovery being corrupted.
Quite simply if it's under warranty, contact google.
Click to expand...
Click to collapse
Not entirely true. If OEM unlocking was previously enabled, then despite your phone being locked, it will still accept the unlocking command. Just happened to me. I am trading in my phone. I uninstalled Magisk, booted to bootloader, locked the bootloader and got the dreaded "Can't find valid operating system" alert. I thought it was toast since no response to adb at that point. The screen looked like the bootloader screen but with less text. Finally used vol down/pwr to get to bootloader, re-unlocked and re-flashed the OS. Back in business, at least getting my full trade-in price!

flash.android.com really helped, thank you!
device locked (locking the device is what caused this for me) and windows saying it doesnt recognize the device when I plugged it in while in the bootloader. For some reason flash.android.com recognized the device, not sure why

same thing happened with right now
i was trying to lock bootloader on custom rom (nonsense,i know)
so,phone wasnt being recognized by pc,and somehow android flash tool recognized and i clicked flashing and it needed bootloader to be unlocked so it did,and phone booted back on custom rom.
nice

yearn2burn said:
Not entirely true. If OEM unlocking was previously enabled, then despite your phone being locked, it will still accept the unlocking command. Just happened to me. I am trading in my phone. I uninstalled Magisk, booted to bootloader, locked the bootloader and got the dreaded "Can't find valid operating system" alert. I thought it was toast since no response to adb at that point. The screen looked like the bootloader screen but with less text. Finally used vol down/pwr to get to bootloader, re-unlocked and re-flashed the OS. Back in business, at least getting my full trade-in price!
Click to expand...
Click to collapse
Just happened to my Pixel 4a5G trade-in for Pixel 7. Completely uninstalled magisk and then tried to re-lock the bootloader. Bootloader locked and got the no operating system error. Called google and they said send it in as and I will get full amount. The dude did not sound very reassuring. I luckyly stumbled on this thread. tried to unlock the bootloader but it failed. I reset my computer and tried it again and it worked. Phone booted up. I took and OTA and tried to re-lock the bootloader and SUCCESS. This phone never had an OTA so I believe the one slot was empty, maybe that is why this happened. Moral to the story, make sure both slots has an OS on them.
Thanks
BB

bradwatson said:
Not sure if anyone still needs help with this, but I just ran into this issue on my Pixel 4 XL and I held down the volume down button and power button to reboot into fastboot. From there you can connect to a PC and flash images or unlock/lock bootloader, etc.
From there I was able to use the flash.android.com site and flash the latest OTA to my phone and now I'm back up and running.
Hope this helps someone down the road.
Click to expand...
Click to collapse
Thanks! This was exactly what I needed. I didn't realize you could get into fastboot with hardware controls and I was trying through adb

I'm an idiot and did this same thing.

bradwatson said:
Not sure if anyone still needs help with this, but I just ran into this issue on my Pixel 4 XL and I held down the volume down button and power button to reboot into fastboot. From there you can connect to a PC and flash images or unlock/lock bootloader, etc.
From there I was able to use the flash.android.com site and flash the latest OTA to my phone and now I'm back up and running.
Hope this helps someone down the road.
Click to expand...
Click to collapse
Just wanted to say thanks - had a panic moment until I read this and realized I could do that. Pixel 4 wiped and ready to go back. Thanks again, years later.