LG G4(bootloop after flashing wrong boot image) - G4 Q&A, Help & Troubleshooting

Hello guys,
I have a big problem. Today i wanted to unlock my bootloader, flash a custom recovery and root my phone. Unlock the bootloader wasnt a problem. Then i boot the recovery.img from adb to install it from there, but when i wanted to install it first i selected the wrong option(boot not recovery). So after a restart i just came always back in the recovery. So i searched a boot image to install it with twrp. I think i found and installed the wrong one because now i only see the animation of lg, thats all. Please can anyone help me?

When u enter download or fastboot mode then u van flash an kdz or a TWRP.img
.

freeman86 said:
Hello guys,
I have a big problem. Today i wanted to unlock my bootloader, flash a custom recovery and root my phone. Unlock the bootloader wasnt a problem. Then i boot the recovery.img from adb to install it from there, but when i wanted to install it first i selected the wrong option(boot not recovery). So after a restart i just came always back in the recovery. So i searched a boot image to install it with twrp. I think i found and installed the wrong one because now i only see the animation of lg, thats all. Please can anyone help me?
Click to expand...
Click to collapse
Well first at all you didn't make any mistake by installing recovery.img as boot. Couse after that you had to install recovery.img using TWRP at first boot. There are tutorials how to that properly, dunno why u dont read carefully before doing something like that.
Now i think the easiest solution would be just reinstall stock rom using LGUP tool. Ofcourse you can still try use adb tool. What you need to do is to find proper boot file for you model and android version and put it to adb folder and flash it same as recovery.
You can easy get into download mode by taking battery out, connecting phone using usb with computer and then while holding volume up button put back battery.
Tutotial how to enter fastboot from download mode: https://forum.xda-developers.com/g4/general/guide-how-to-enter-fastboot-mode-t3239537
I would recommend to start using google. As i spent like 5 mins to gather all info for that.

Related

[Q] Can't enter recovery Verizon m8

Hello guys, I've had a problem with my phone since flashing 5.0 firmware months ago but I'm just now getting to fixing it.
I have twrp recovery and some 5.0.1 rom that was in beta awhile ago. Everytime I boot into twrp in boots right into fastboot, whatever it's called, after about 5 seconds, so I can't flash any roms, which I think is the problem since it's pretty buggy.
Another thing is that Whenever I charge the phone while it's off, it boots into bootloader and therefore stops charging. Anyway I can fix my recovery without recovery?
This is Verizon htc one m8.
Thanks guys.
Edit: tried using twrp app to reinstall recovery but it boots into bootloader instead.
Fire n mage said:
Hello guys, I've had a problem with my phone since flashing 5.0 firmware months ago but I'm just now getting to fixing it.
I have twrp recovery and some 5.0.1 rom that was in beta awhile ago. Everytime I boot into twrp in boots right into fastboot, whatever it's called, after about 5 seconds, so I can't flash any roms, which I think is the problem since it's pretty buggy.
Another thing is that Whenever I charge the phone while it's off, it boots into bootloader and therefore stops charging. Anyway I can fix my recovery without recovery?
This is Verizon htc one m8.
Thanks guys.
Edit: tried using twrp app to reinstall recovery but it boots into bootloader instead.
Click to expand...
Click to collapse
Of course there's a way. Just like the way you first installed a custom recovery. I will give you instructions in case you've forgotten, or if the phone was pre-rooted when you got it.
Download the latest TWRP from here onto your PC.
When the download is finished, rename it to recovery.img and place it into your fastboot folder.
Hook up your phone to your PC, get into ADB/fastboot, and issue the command fastboot flash recovery recovery.img
Then when it's done fastboot reboot
You should now have a working TWRP recovery.
xunholyx said:
Of course there's a way. Just like the way you first installed a custom recovery. I will give you instructions in case you've forgotten, or if the phone was pre-rooted when you got it.
Download the latest TWRP from here onto your PC.
When the download is finished, rename it to recovery.img and place it into your fastboot folder.
Hook up your phone to your PC, get into ADB/fastboot, and issue the command fastboot flash recovery recovery.img
Then when it's done fastboot reboot
You should now have a working TWRP recovery.
Click to expand...
Click to collapse
Had to use my brother computer and set it up since I got a mac. Thanks for your reply, and sorry for the double post, I installed via fastboot, and I can confirm the most updated version was pushed to the device, but it still goes right into fastboot after booting into recovery.img
Edit: Did that fastboot erase cache thing in the command prompt and now it works. Thanks for telling me the commands for cmd again!
Fire n mage said:
Had to use my brother computer and set it up since I got a mac. Thanks for your reply, and sorry for the double post, I installed via fastboot, and I can confirm the most updated version was pushed to the device, but it still goes right into fastboot after booting into recovery.img
Edit: Did that fastboot erase cache thing in the command prompt and now it works. Thanks for telling me the commands for cmd again!
Click to expand...
Click to collapse
Oh Crap! I forgot to add that one. :silly:Erase cache is obviously needed. Sorry.

Stuck at boot

Hi hoping someone can help, I accidentally wrote the wrong file to my system partition and am stuck at smartwatch 3 logo.
i tried pc companion and it tells be there "no software available for my device" all i can get to is fastboot mode stock recovery is gone too
I wrote twrp to it but as of yet have not been able to launch it. its running 5.1.1 os and i cant remember build number other than it began with an L
Please help
ZR1
if you read this and know i have no hope please let me know that too please
seems like if i had stock partitions images i could flash using adb i"d be good yes?? no?
I do not have time to help right now, but since you can get to fastboot, you are probably fine. Find the stock 5.1.1 recovery and boot to it. Then sideload the latest update. You will be good to go.
The command in a terminal window is...
Code:
Fastboot boot <stock recovery.img>
Alternatively, you can boot to twrp and install a twrp flushable zip.
Good luck.
Lekofraggle thank you for your help.
I did what you said with img file from this thread http://forum.xda-developers.com/sma...50-version-t2988087/post62897403#post62897403
it wrote the img file but still just hangs at boot image, and i still cant get twrp to work after holding power button and choosing recovery option screen goes blank and then starts to boot and hangs at smartwatch 3 image
all the things i"ve rooted before in my life i"ve never screwed up this bad.
zr1 said:
Lekofraggle thank you for your help.
I did what you said with img file from this thread http://forum.xda-developers.com/sma...50-version-t2988087/post62897403#post62897403
it wrote the img file but still just hangs at boot image, and i still cant get twrp to work after holding power button and choosing recovery option screen goes blank and then starts to boot and hangs at smartwatch 3 image
all the things i"ve rooted before in my life i"ve never screwed up this bad.
Click to expand...
Click to collapse
Have you tried Sony Companion to repair your watch?
If you were running 5.1.1, then the recovery you mention is for 5.0.1, so that might be the reason why you can not boot into it. See if you can find the stock recovery for 5.1.1
I have used the following method a couple of times now to get me out of trouble after playing around with my SW3
http://forum.xda-developers.com/smartwatch-3/general/guide-roll-watch-to-previous-software-t3176801
You can then use the stock recovery you already have and update via OTA files to get it back to the latest firmware or via Sony Companion.
I had the exact same issue after I did fastboot flash using corrupt system.img (which wasn't a snapshot that could be flashed but rather a tarball). Since you have TWRP installed you can confirm this by trying to mount system partition in recovery mode. After it fails, connect to recovery via adb and view latest kernel messages (dmesg). It should show something like "failed to locate ext4 filesystem".
If this is your case, you can use TWRP restore function to restore system from your TWRP backup. It will then erase the partition, mkfs.ext4 and write the files from tarball. This did the trick for me.
(If you don't have backup, try looking for downloads in other threads here)
Edit: Re-read your post. Since your TWRP is broken, try hotbooting it using fastboot boot new_boot.img (you can take it here)
ebones thank you thank you thank you
I had downloaded new_boot img already so im not sure what i was doing wrong but i did what you said and she booted right into TWRP i now have to sideload the right update.zip file and run it in twrp correct?
edit; having trouble sideloading wear-supersu.zip what is the correct command?
GOT IT!!! I installed stock rom from this thread http://forum.xda-developers.com/sma...rom-repacked-stock-rom-swr50-version-t2988087 through TWRP and it works cant thank you guys enough
Thanks ZR1

[Brick phone] help needed

I have flashed many phones before my G4 and this is the first time I'm having to ask for help.
The firmware installed was AICP CM13, then the screen went green with a DemiGod message. I held the vol down button to reboot and it came back up. After a few restarts and green screens i figured I needed to reflash the firmware. I booted into Recovery and while wiping the device to flash a new firmware, TWRP crashed. After leaving it for half hour or so, I took the battery out to enter into TWRP so I can flash the new firmware. TWRP is no there to be seen. I hold down the vol down and power button, releasing power for second or two and choose to go into recovery. Every time the phone just gets stuck on the LG screen displaying "Bootloader state :Bootlader unlocked!".
In short, I have no firmware, the device has been wiped and TWRP doesn't seem to be working.
I have tried to flash a KDZ file (H81520A_00.kdz) using the flash guide here. This comes back as unsuccessful saying "connection to server failed". As shown below.
View attachment 3605673
The method to flash an .img file using cmd on the pc includes moving the 4gb .img file to the parent folder of the phone storage. I can't get to move any files whatsoever to my device so figured this method would not work.
Seems if I can somehow flash TWRP, then I should be able to install a new firmware.
Any help much appreciated.
Hi, Can you get an ADB connection to your phone, or get your phone into bootloader somehow. From there you could try 'fastboot boot recovery.img'?
If so, then from within TWRP you can flash twrp recovery so the recovery is then sorted. Then you could flash click here (the full version). This will then allow LG UP to find a connection. From there if you really wanted to can flash any KDZ as a proper reset. Hope it works buddy!!
rav101 said:
Hi, Can you get an ADB connection to your phone, or get your phone into bootloader somehow. From there you could try 'fastboot boot recovery.img'?
If so, then from within TWRP you can flash twrp recovery so the recovery is then sorted. Then you could flash click here (the full version). This will then allow LG UP to find a connection. From there if you really wanted to can flash any KDZ as a proper reset. Hope it works buddy!!
Click to expand...
Click to collapse
I can get into recovery but I am unsure as to how I could try 'fastboot boot recovery.img'. Would that be the same as flashing an img when the root method first came out?
AndHD2 said:
I can get into recovery but I am unsure as to how I could try 'fastboot boot recovery.img'. Would that be the same as flashing an img when the root method first came out?
Click to expand...
Click to collapse
Just to make sure you know. TWRP is your recovery. Your last message said you did not have TWRP?
When I first rooted my phone (and subsequently when I install a .kdz), I have to go into the bootloader and install TWRP. I personally do this by using the above command "fastboot boot recovery.img" with the recovery.img being placed on my computer in the same location as my adb installation. This command only boots up TWRP but does not flash it. I then flash twrp by having a copy of it on my external sd card. Within twrp you can select to flash zip, or there is an option to flash an image. I use this to flash twrp (from twrp... its a little inception like but it works). Once you have twrp up and running, you can install a rom. If you want to do flash a .kdz, I have found you need to be on a stock based rom in the first place hence why i referenced the v20a full system zip.
Hope that made sense.
Regards,
Ravi
It is late here and with me being tired I said recovery instead of download. I can boot into download mode but when I try to boot into recovery then it just goes straight to the LG splash screen and it will either remain in that screen or the green Demigod screen would come up.
I'm off to sleep and away from my laptop as I have to be up in 5 hours. Luckily I still have my Note 4 so at least I'm not without a phone in the morning. I will try the steps what you have suggested just as soon as I get back from work.
Many thanks
rav101 said:
Just to make sure you know. TWRP is your recovery. Your last message said you did not have TWRP?
When I first rooted my phone (and subsequently when I install a .kdz), I have to go into the bootloader and install TWRP. I personally do this by using the above command "fastboot boot recovery.img" with the recovery.img being placed on my computer in the same location as my adb installation. This command only boots up TWRP but does not flash it. I then flash twrp by having a copy of it on my external sd card. Within twrp you can select to flash zip, or there is an option to flash an image. I use this to flash twrp (from twrp... its a little inception like but it works). Once you have twrp up and running, you can install a rom. If you want to do flash a .kdz, I have found you need to be on a stock based rom in the first place hence why i referenced the v20a full system zip.
Hope that made sense.
Regards,
Ravi
Click to expand...
Click to collapse
I have finally got chance to sit down and have a go at performing the procedure listed above. I downloaded the adb and fastboot installation as outline here. It is the minimum to what this thread says I will need for my device. I moved the recovery.img to the installation location which were in Windows/programs files (x86)/Minimal adb and fastboot. I launched the program and typed in 'fastboot boot recovery.img'. I tried this in download mode, charging mode (phone off) and while on the LG flash screen where TWRP didnt load but in all cases I have had no response at all.
If someone can help the much appreciated.
AndHD2 said:
I have finally got chance to sit down and have a go at performing the procedure listed above. I downloaded the adb and fastboot installation as outline here. It is the minimum to what this thread says I will need for my device. I moved the recovery.img to the installation location which were in Windows/programs files (x86)/Minimal adb and fastboot. I launched the program and typed in 'fastboot boot recovery.img'. I tried this in download mode, charging mode (phone off) and while on the LG flash screen where TWRP didnt load but in all cases I have had no response at all.
If someone can help the much appreciated.
Click to expand...
Click to collapse
Hi @AndHD2, I'm sorry but I can't think of anything else
rav101 said:
Hi @AndHD2, I'm sorry but I can't think of anything else
Click to expand...
Click to collapse
I had another demigod type screen but this was grey and not green with less detail. However it did say it were a kernel error.
Is the handset still under warrenty with the bootloader unlocked. I have a feeling its not

Can't enter recovery 551ml...Z00A

Hi
Problem is that I can't enter recovery. I am able to enter fastboot menu, but when I'm choosing recovery mode, phone like restarts and goes again to fastboot menu...no recovery mode or dead bot with error comes. Below is blue writing "continue the fastboot process".
This happened after I tried to install twrp through twrp manager...it was installing twrp and said that install succesful.
Also tried fastboot command "fastboot clear cache", but nothing.
So, you didn't unlock the bootloader and removed your recovery...
1st thing, go to bootloader mode, download the recovery for your version of Android, eg 2.20.40.168, and flash through fastboot on the PC.
Put phone in fastboot (bootloader mode) - I'm assuming of course you have the latest Intel drivers and the flashing tools - and through the CMD interface (agasin flashing tools) type "fastboot devices". If you did it right then you'll see you serial number...
Now, in the same folder as the fastboot tools, have the recovery.img ready and type "fastboot flash recovery recovery.img".
You should now have recovery again...
2. If you haven't done so, lookup how to unlock bootloader before trying this again and do it. Make sure everything goes as it says, particularly important the splashscreen that says ASUS turns white, and you should be ok to flash TWRP though I use PC as I find everything seems to work.
Yes, it was my mistake, i didn't unlock bootloader and tried to flash twrp.
Now i can Go into fastboot and phone connects to pc easily.
But so far i didn't found recovery image for 2.20.40.174 fw.
But can you confirm that it's possible now to use one click bootloader unlock and then flash twrp? Without flashing stock recovery.
Jaaguar86 said:
Yes, it was my mistake, i didn't unlock bootloader and tried to flash twrp.
Now i can Go into fastboot and phone connects to pc easily.
But so far i didn't found recovery image for 2.20.40.174 fw.
But can you confirm that it's possible now to use one click bootloader unlock and then flash twrp? Without flashing stock recovery.
Click to expand...
Click to collapse
You can use This Apk to unlock bootloader.
Once unlocked it will reboot and show white splashscree,then you are ready to use twrp.
Try it
If you go to the pre-rooted rom thread you can download ALL the img files - rom, recovery,boot and droidboot.img. I'm pretty sure 174 was there in the Mega link at the top of the 1st post...
Just download the recovery.img as that's what you need...
Ok, thanks to all. Now bootloader is unlocked, twrp installed and installed rom blisspop. Great phone when there is no bloatware.
Sent from my ASUS_Z00A using XDA Premium 4 mobile app
Cool, glad you got your toy working again...
Same issue as sir Jaguar
Already installed .img trough adb says succesfully installed
When i go to recovery mode no deadbot no white splash screen load.
Tried the asus unlocking tool provided by the asus and the same link provided by sir Ultima still no good results.
Im already at 174 fw
Tried the twrp apk
Tried flashify
Tried diffrent kind of .img
Tried to re install the image using ADB
Still no good results
I think its the bootloader that has the problem.
Guys plz help tnx
thank you for your hard work!! love it
you can try to reflash the corresponding version of stock recovery.img
ultramag69 said:
If you go to the pre-rooted rom thread you can download ALL the img files - rom, recovery,boot and droidboot.img. I'm pretty sure 174 was there in the Mega link at the top of the 1st post...
Just download the recovery.img as that's what you need...
Click to expand...
Click to collapse
i can not find the link u r talking about .. please can u repost it i srsly need the recovery.img file
thanks in advance
amanbansal009 said:
i can not find the link u r talking about .. please can u repost it i srsly need the recovery.img file
thanks in advance
Click to expand...
Click to collapse
http://forum.xda-developers.com/zenfone2/development/rom-pre-root-img-t3079590
Hi there, I have a similar problem i think. I have unlocked bootloader.
My problem is PC won't regonize my device. I installed the driver for intel asus adb but it would says "error: device not found" for fastboot cmd.
so now i m stuck in fastboot and can't do anything ...
Hi, Also have my phone on the same conditions but If I try to flash anything I got permission Denied.
Please help me

recovery won't open

good day,
i have an HTC 10 factory unlocked, i had the bootloader unlocked through HTCdev. i then flashed the latest TWRP recovery, attempting to enter revovery....i cant. i din't get the triangle thingy what so ever,it jus displayed the screen like when you're about to enter bootloader mode. then it would restart after that, almost brick it cuz it didn't wanna boot at one pointing time :crying::crying: .i've rooted m7,8 & 9 and never came across something like that. i can't even flash over new rom cuz cmd is given error: can't open recovery. before i attempted bootloader unlock via htcdev, i tried sunshine jus to avoid the hassle and when it was attempting to give me temproot, it failed....3 times so that was useless,leaving me to go manual. any help on this?
Wrong thread. But sounds like recovery didn't flash. Make sure your flashing to recovery partition. Search thread for toolkit, will make it easier.
Fastboot flash recovery recovery. IMG @download mode
I used this tool to safely and successfully install ROM and Recovery.. Maybe you could try..
Thanks to the developer..
https://forum.xda-developers.com/htc-10/how-to/2016-05-27-fastboot-flashing-firmware-t3387520
Not sure if this helps, but I get the same type of issue when booting to recovery, except my phone is bone stock.
What works for me is right after the symbol comes up, press Vol Up and Power at the same time. If I time it right, recovery mode comes up. Not sure if it will work with TWRP, since I've never used it.
Sent from my htc_pmewl using XDA Labs
2WildFirE said:
Fastboot flash recovery recovery. IMG @download mode
Click to expand...
Click to collapse
that's what i did but still showing error:can't open recovery

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