Develop Bugs

[Q] LG G E988 can't boot in download mode

Hi all.
I need help from a hivemind. I've got a LG G E988 with E98820B firmware. I've rooted it via ioroot (successfully) and tried to install custom recovery via freegee, and now my phone is not booting into download mode. If I try to reboot it from my PC using adb, I get "boot certification verify" error. Otherwise phone is booting fine into it's stock HK firmware.
So, long story short, I need download mode to flash stock european firmware but I have this strange error. Closest thing to solution of my problem is this thread , but I want something less radical. In case if something less radical exists.
Any ideas?

fautro said:
Hi all.
I need help from a hivemind. I've got a LG G E988 with E98820B firmware. I've rooted it via ioroot (successfully) and tried to install custom recovery via freegee, and now my phone is not booting into download mode. If I try to reboot it from my PC using adb, I get "boot certification verify" error. Otherwise phone is booting fine into it's stock HK firmware.
So, long story short, I need download mode to flash stock european firmware but I have this strange error. Closest thing to solution of my problem is this thread , but I want something less radical. In case if something less radical exists.
Any ideas?
Click to expand...
Click to collapse
Did you power off device via home power button? When you power down, then try to power back on just hit the power button then hold the plus and minus volume rocker while letting go of power button.

Yes. It casually boots up into rom. I think I somehow messed up my recovery. So is there any way to restore recovery, or flash custom recovery, without booting up in download mode?

fautro said:
Yes. It casually boots up into rom. I think I somehow messed up my recovery. So is there any way to restore recovery, or flash custom recovery, without booting up in download mode?
Click to expand...
Click to collapse
Enable USB Debugging
Connect mobile with PC and select LG Software (Wait for 1-2 minutes and let the drivers install)
Once drivers are installed, Run LG flash tool and start flashing KDZ. It will automatically boot it into download mode and flashing process will start. (If flashing stops / stuck at 4% and your phone is in download mode, remove USB cable, close LG flashtool.... connect USB cable again and restart KDZ flashing)

Tried. Now I can't boot into download mode AND can't boot into rom. And none of my computers see my phone in this state. Any possible explanations for such situation? And what to do about it..

H815 stuck in bootloop, no download mode or recovery

Hello,
I unlocked the bootloader on my LG G4, flashed TWRP and then using TWRP flashed a SuperSU plus a new bootloader for Android M along with the Android M system etc...
The phone is now stuck in a bootloop.
I can no longer get in to TWRP and can get into download mode very briefly before the phone reboots again. My PC can not detect the phone at all.
Can anyone help? Have a feeling I've hard bricked the phone
Thanks, Ben

i have the same issue

benlanghorne said:
Hello,
I unlocked the bootloader on my LG G4, flashed TWRP and then using TWRP flashed a SuperSU plus a new bootloader for Android M along with the Android M system etc...
The phone is now stuck in a bootloop.
I can no longer get in to TWRP and can get into download mode very briefly before the phone reboots again. My PC can not detect the phone at all.
Can anyone help? Have a feeling I've hard bricked the phone
Thanks, Ben
Click to expand...
Click to collapse
wait flastool update for put android 6.0 kdz . antiroll back system on motherboard

Hello Everyone. Someone has got news? Cause my lg g4 stuck on the same issue.
I unlock bootloader and try to install twrp. Via fastboot flash command twrp doesn't seem to get installed. So i try to boot in twrp and then install the img to the recovery partition. All seemed to go fine. When i try to reboot to recovery twrp ask me to root the device. Why not? I leave twrp installs superSu (I think this was my mistake). Now I've a continuous bootloop, even if I simply plug it to the charger. Vol down + Power buttons neither vol up + power doesn't work.
Sorry for bad english

I think one way is to disconnect the battery by disassembling the phone(check Google), then reconnect it and boot to recovery using the correct key combinations. I hope it works.It worked for me.

Install the LGUP tool:
http://forum.xda-developers.com/g4/help/lgup-install-kdz-mm-lp-t3249803
Install both file.
Download the kdz files:
http://forum.xda-developers.com/showpost.php?p=64298942&postcount=6
This V20A MM, for 5.1 or v20b you have to search.
Power down your phone.
Push and hold Volume Up and then plug the phone via USB to your PC.
The Phone enter the download mode.
Start LGUP, select the KDZ file.
If you choose "upgrade" all data will be obtain, if you choose "refurbish" all data will be lost.
I suggest "refurbish" because for me "upgrade" dont work without fc and system carshes.
Wait around 5 minutes and your G4 is back with MM, clean and fresh.

Thanks hannsheinz for the reply.
I solved this night in this way (very similar to your suggestion):
- I downloaded and installed LG Bridge from the official website.
- I pull out the battery to power off the device.
- I reinsert the battery in the device, without power it on.
- I plug in the usb while pressing volume up button.
- The device entered the download mode and LG Bridge recognized it.
- I press "update error recovery" in Lg Bridge (bottom right in the Software update tab).
- The procedure will take a while according to your pc and internet connection.
- At the end my G4 "breathed again and still breathing"
Very similar to what hannsheinz suggested.
Thanks to all

LG G4 bricked - cannot get into recovery or download mode.

Hello everyone, I hope you can help me. My husband tried to downgrade his LG G4 UK model from Marshmallow to Lollipop, using LGUP. The process failed and the phone is now bricked. I switch it on, and the "LG powered by Android" screen comes on, followed by the other LG screen. The phone just sits like that. I have tried to boot to recovery, and boot to download mode; but can do neither. I have also tried connecting to LGUP, LG Bridge, and the LG Mobile Support Tool. None of these can find the phone, as it needs to be switched on to be located by the programs. When I connect the phone to my laptop, I get the "thump" sound that shows the phone is connected to the computer. That is all I can get though. Is there a way out of this, and back to getting the phone working again? I would be grateful for any advice you can offer me to resolve this issue.

I think it's hard bricked. In that case, you can't recover it.

SirDarknight said:
I think it's hard bricked. In that case, you can't recover it.
Click to expand...
Click to collapse
I have now been able to get the phone into download mode. I was hoping that getting into download mode might help LGUP to see the phone, but I can't find a way of doing that.

We're on the same boat.

Did It - Fixed It!
drumbeater79 said:
We're on the same boat.
Click to expand...
Click to collapse
I took a punt, and the punt worked. I disconnected the phone from the computer, and pulled the battery. Then I re-inserted the battery. Next, I tried to get the phone to boot into download mode, by pressing power and volume down; with the phone disconnected from the computer. The phone then brought up a screen, asking if I wanted to do a factory reset. I chose "yes" and it asked me again (presumably in case I had pressed "yes" in error. The phone then powered down, before powering up, and optimising apps. Then it went to the welcome/sign in screen. All the previous apps are lost, but at least the phone is working now. Hubby is chuffed to bits with his "new" phone.
@SirDarknight @drumbeater79

Glad to hear that!

ursulavasey said:
I took a punt, and the punt worked. I disconnected the phone from the computer, and pulled the battery. Then I re-inserted the battery. Next, I tried to get the phone to boot into download mode, by pressing power and volume down; with the phone disconnected from the computer. The phone then brought up a screen, asking if I wanted to do a factory reset. I chose "yes" and it asked me again (presumably in case I had pressed "yes" in error. The phone then powered down, before powering up, and optimising apps. Then it went to the welcome/sign in screen. All the previous apps are lost, but at least the phone is working now. Hubby is chuffed to bits with his "new" phone.
@SirDarknight @drumbeater79
Click to expand...
Click to collapse
It's a hard reset, not download mode. Glad that it worked for you I already tried it several times but I can't get past the screen saying Android starting apps.

stuck at Bootloader screen! ?

when i boot up my device it goes strait to the screen where u
boot to bootloader
boot to download mode
boot to recovery mode
ddr test
powerdown
when i select either except power down
it just boots back to the before mentioned white bootloader screen
i also tried 0PJAIMG.ZIP and put it in SDCard
i am s-off unlocked ---is it fixable or done for
(HTC M9 Verizon [ROM] Fluent ROM v4.0.0 -- Marshmallow 3.37.605.7 --
the Guy where i got it
said it happened
while ruu to
take off red letter boot warning where it gets to( flush
again immediately)----- it happened

Dayliter said:
when i select either except power down
it just boots back to the before mentioned
Click to expand...
Click to collapse
To clarify, are you saying that selecting any of the options except 'Power Down' cause you to reboot back into download mode?

computerslayer said:
To clarify, are you saying that selecting any of the options except 'Power Down' cause you to reboot back into download mode?
Click to expand...
Click to collapse
boot to bootloader white screen only if i slect boot to download it reboots to white bootloader screen everytime

Well, you've already tried RUU via sdcard. From your choice of ROM, it looks like you're using a Verizon-branded device - is that correct?
It may be worth connecting your phone to a PC and attempting to repair your phone using Verizon's Software Upgrade Assistant (start with HTC's Sync Manager) to repair the phone. Verizon provides instructions on it's website.
Assuming this works - and that's a bit of a long shot, given your symptoms - you'll almost certainly be returned to a S-ON state. If your phone is currently non-functional, that seems worthwhile but you'll have to make that decision.

HTC's Sync Manager come up auto when phone gets connected but cant get phone to connect to it good idea tho-i will leave it hooked awhile mabe it will --------

Dayliter said:
HTC's Sync Manager come up auto when phone gets connected but cant get phone to connect to it good idea tho-i will leave it hooked awhile mabe it will --------
Click to expand...
Click to collapse
I have a very similar problem. My phone is Unlocked and S-OFF. I tried to install TWRP after I had gone back to a standard rom. When I went to recovery it boot looped. To get back to bootloader I have to hold volume up and down if I try to go to download mode it boot loops if I power down with whilst connected to the computer it boot loops. I have tried to install a standard rom but get partition errors "remote: partition table doesn't exist". Does anyone have any Ideas?

H815 Soft bricked(?) adb shows device offline

Soo.... I messed up and edited the build.prop specificly the ro.build.type property. I tried to enable some debug options without validating if this would be a good idea (hint: it's not).
It seems that this has bricked my phone, the first LG splash screen shows up with the powered by android, and the second animation just keeps loading forever (making the phone very hot). And the LED flashes blue continously.
I did manage to get the device visible in ADB but it tells me that the device is offline so I can't do anything with it.
Tried booting in recovery mode (holding power button + volume down) but it just own't go into recovery mode.
Some extra info of what runs on my phone:
- version H815
- Android 6.0
- bootloader unlocked
- TWRP installed
- Rooted
- XPosed installed
Any idea on what I could try to fix it? (I guess stuck with a brick but oh well).
Thanks!

What do you mean, by it can't go into recovery mode?
Nothing is showing on screen?

Go to downlod mode either use lgup or lg flashtool to reflash the firmware that you are on... Do u remember which firmware you were on ?

Thanks for the replies!
Vortuks said:
What do you mean, by it can't go into recovery mode?
Nothing is showing on screen?
Click to expand...
Click to collapse
I meant that it just boots 'normally' when I press those buttons, it shows me the first LG logo and the second animation just hangs, whatever I do. I tried all sorts of combinations with the power button + volume down. (Keeping it pressed, briefly letting it go after the lg logo and repressing them).
jinderation said:
Go to downlod mode either use lgup or lg flashtool to reflash the firmware that you are on... Do u remember which firmware you were on ?
Click to expand...
Click to collapse
I don't know exactly which firmware I was on but I can't even get my phone into download mode (same as my other response, pressing volume up doesn't do anything).
The recovery and download mode used to work but I have no idea why it doesn't now...

When booting the phone, hold the power button and volume down button simultaneously, when LG logo appear, push the power button again. You should see the white screen, where you choose "YES" twice. Then the phone should kick you into TWRP or different recovery mode.

But how the hell editing build.prop can mess with recovery and download mode? Sounds incredible

Vortuks said:
But how the hell editing build.prop can mess with recovery and download mode? Sounds incredible
Click to expand...
Click to collapse
Maybe he has bootloop issue... ILAPO

Yeah I have no idea why the buttons aren't working for me. After a lot of searching I found this thread:
http://forum.xda-developers.com/g4/help/soft-bricked-device-t3248144
Which is basicly the same thing I'm experiencing, ADB comes online for just a brief second (kept spamming the reboot recovery command) and got in TWRP and I just flashed another which worked fine.
Odd thing is, even now my phone works I can't start recovery or download with the hardware buttons...... oh well, thankfully adb works as it's supposed to.
Thank you all for your help!