Secure boot error after reverting to KitKat via TWRP backup - G2 Q&A, Help & Troubleshooting

Hey everybody! Please, I need urgent help!
So, yesterday, I upgraded my G2 D802 from rooted stock KitKat to the official European Lollipop, v30b. Before that, I made a TWRP backup of everything.
So, I rooted Lollipop, installed TWRP, and was about to install the new Xposed for Lollipop. Then, **** started freaking out and "LGSmartCover" kept crashing continuously, making it virtually impossible to navigate the UI.
Soooooo, I decided to revert back to KitKat via the TWRP backup.
Everything SEEMED fine, but now I cannot boot. I get the LG logo, then this message appears:
ERROR : boot certification verify
[800]_______________________
[850]
[900] Secure booting Error!
[950] Cause : boot certification verify
[1010]
[1060]_________________________
Click to expand...
Click to collapse
I do not seem to be able to enter download mode or recovery either.
My computer does recognise it as "qhsusb_bulk" when plugged in, though.
What do? I'll be eternally grateful if somebody can help me solve this.
UPDATE: I somehow managed to get into this "Hardware key control mode" by pressing and holding all three hardware buttons at once, while plugging the phone into the computer.
UPDATE2: Somehow, I managed to boot into Download mode, after doing the same thing over and over again! Trying to recover via LGMobileSupportTool now..
{
"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"
}

same error
How did you solve it ?

Hi,
I had a similar problem and I managed to repair the phone by using the TOT method with LG FlashTool v1.8 by reaching download mode.
Good luck!

If you can fully enter download mode(first screen and then the second screen),then try to flash a stock rom with LG Flashtool(KDZ method) or TOT method.
Since you were using TWRP,official LG Update tools will kill your phone if you try to flash the stock rom with them.

i have the same problem and i dont know how to reach download mode. when i connect my phome to the pc, it shows the same secure boot error. any help?

davvmaulana said:
i have the same problem and i dont know how to reach download mode. when i connect my phome to the pc, it shows the same secure boot error. any help?
Click to expand...
Click to collapse
Supposing the drivers are installed in windows, you need to have the phone plugged in to comp. and then hold volume-up+power until you get the "download mode" on your phone's screen

Related

[Q] Please help me for unbrick my D802

Hi all,
I am so sad and feel myself as a idiot.
I had D802int version of G2 with rooted and PhilZ Touch recovery which is based on CWM.
Due to not deliveried to my country of KitKat i tried to update my phone with this guide
Everythings were fine. After that i tried to change my TRWP recovery with CWM for external usb storage to restore my nandroid backup and i follow this guide
But I think missed some instruction so my phone stayed in black screen with LG logo (bootlogo - no animation just frozen)
When I try recovery mod it says Secure: Booting error Cause: Boot certification verify on white screen and reset rapidly.
So i check several topics and i applied also download mod and back to stock (kdz uploader method)
For download mod it couldnt jump 2nd step stayed in like this
{
"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"
}
it couldnt go on 2nd step like this
when i plug usb cable pc didnt recognize as well (no plug-in sound for driver)
Can you help me pls. If I rescue my phone i will quit a long time for this kind of works i think
Can u enter download mode?
Sent from my LG-D802 using xda app-developers app
maxkanick said:
Can u enter download mode?
Sent from my LG-D802 using xda app-developers app
Click to expand...
Click to collapse
He just stated that he can go to download mode.
OP your issue is drivers. The phone is not connected to the pc. Try uninstalling and reinstalling drivers and see if that help
gypsy214 said:
He just stated that he can go to download mode.
OP your issue is drivers. The phone is not connected to the pc. Try uninstalling and reinstalling drivers and see if that help
Click to expand...
Click to collapse
unfortunately pc connot recognize so i couldnt install drivers.
So what happened: recovery mod fail, download mod fail, boot fail, pc dont recognize phone
It was terrible but this topic save my life
http://forum.xda-developers.com/showthread.php?p=51123570
I lost my root but got back my phone. The issue is when i got twrp i install flashable rom which was in my internal storage if dont i cannot alive.
thanks again

[Q] Bricked D802, Any help?

Hello, I'm new to this forum, and like every newbie, I'm asking for help.
My problem is this:
I bought a LG G2 D802 32GB, it was rooted and with CMW. I intalled LG Mobile Support Tool and it appeared that there was a new firmware (apparently 80220C) so I installed with that software, but when it finished, the phone restarted and got stuck on the LG logo. The only thing I could do was to get into Fastboot mode and from this post: http://forum.xda-developers.com/showthread.php?t=2477595 I managed to get into the Download mode (That one with the Firmware Update message: btw it appears: "USER B100 ROOTED"), the thing was that I didn't know which exact version of 80220B had my phone, so instead of getting the laf.img mentioned in the thread (the one of cms88168 was 80210B), I used one named: "Europe OPEN D80220B_00". In that way I managed to access Download mode. I then proceeded to use LG Flash Tool 1.8 (Used first 2014 without sucess) both from: http://forum.xda-developers.com/showthread.php?t=2432476 and this message appears:
{
"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"
}
BTW, I used DLL: LGD802_20130912_LGFLASHv160.dll
And the rom I extracted the laf.img was a KDZ (Europe OPEN D80220B_00.kdz), the one I try to install with the LG Flash Tool is a TOT (BIN_LGD802AT-00-V10b-SEA-XX-SEP-04-2013-32G+0.tot)
Please, if someone can help me to fix my phone (I've only had it for 10 days, no way to return it), please.
Thanks in advance and cheers.
UPDATE: I used the DLL from the KDZ file and the same TOT and the LG Flash Tool (v1.8) reached a higher status in the update but failed with this message:
And now it gets stuck in the "Download Mode" screen and in Device Manager theres is no track of the phone.
I don't really know what to do.
Why don't you try with kdz ?
Here
+ you took the ota or ?
Hi, thanks for replying.
All this happened because I updated it connected to my PC.
I tried that and it throws this error: "Problem with communication between cell phone and PC"
The phone won't enter in download mode and when I turn it on, stuck at logo and connect it to PC, it appears like this: "LG AndroidNet USB Serial Port (COM41)" -41 set by me.
Is there a way to access the phone through COM to restore partitions?
No adb or fastboot working.
What can I do?
Hello, I want to update the info about this post:
I definitively had to return the phone for refund.
Now I own a Z2, it's a great phone, although the G2 is a great phone too.
If possible, please close this thread.
Cheers.

[Q] Help / Stuck [D800] - Can't get computers to see phone in Download Mode

I've probably used the LG Flash Tool 10 times the past week on both my home and work computer with no problems. Last night I flashed the KK bootloader and a stock 5.0.2 ROM (after tot'ing back to 4.4.2, rooting, etc).
It hangs at the LG logo and that's where I'm stuck. I tried going into Download Mode, but suddenly both of my computers won't see the phone and give me an error in Device Manager. I've tried uninstalling / reinstalling the drivers as well. Why in the world would that happen unless somehow Download Mode was corrupted, possibly? But it goes into Download Mode fine, and appears to look right...
I've tried getting into recovery but can't. When it should load up TWRP (after telling the G2's "stock" recovery screen I do want to reset), I get the green spinning Android (not the red exclamation) for a second, then it tries to boot up.
{
"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"
}
Any advice would be appreciated as I've never run into this before.
So when the green Android popped up, I tried to hit a combination of the volume and power keys and WAS able to get into recovery. Unfortunately, it appears, somehow, TWRP was overwritten by the stock recovery. I have no idea how that could've happened. Or does stock recovery technically stay in place since this is "loki'd" and not actually unlocked? And if so, is there some way to get back to TWRP that I'm unaware of?
To add to the weirdness, when I plug it in to charge, it doesn't pull up the battery like it usually does when powered off, it just tries to boot up again...
If I could just get the computers to recognize it again...
Installing the LG PC Suite got my drivers to a point where it could recognize it while in Download Mode. MTP still didn't work, but that didn't matter for Download Mode. Not sure what happened, but at least I was able to flash it back again.

Nooblet - Need help with my 1+2

Hi,
I bought my phone from Aliexpress. I am very happy with it, but I am facing some issues:
It was pre installed with some diffrent kinds of bloatware.
- Baidu Browser
- DU Battery Saver
- DU Speed Booster
And more see picture -
{
"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"
}
From time to time it tries to download some kinds of files. Seems to be Bloatware aswell. See picture -
In addition to this, the phone also fails to install update: OxygenOS 2.1.1.
I get a message after the reboot, that the install failed, click to reboot.
I've tried to follow this guide "youtube . com/watch?v=-IGDZxeFHAc" with out hope. Most likely something that I am doing wrong.
I have managed to:
Click the RunMe bat file
Install USB drivers
Unlock bootloader
When I try step 4 Flash TWRP Recovery I get to the following message: " Did you see the "okay", then congratulations you have flashed in the recovery "
I did not see the Okay message, and when I press THE any key to quit and boot to recovery, nothing happend its just stuck on Fastboot mode.
Please if anyone could help me I would be very greatful!
Kind regards ..
Kissfiss
kissfiss said:
Hi,
I bought my phone from Aliexpress. I am very happy with it, but I am facing some issues:
It was pre installed with some diffrent kinds of bloatware.
- Baidu Browser
- DU Battery Saver
- DU Speed Booster
And more see picture -
From time to time it tries to download some kinds of files. Seems to be Bloatware aswell. See picture -
In addition to this, the phone also fails to install update: OxygenOS 2.1.1.
I get a message after the reboot, that the install failed, click to reboot.
I've tried to follow this guide "youtube . com/watch?v=-IGDZxeFHAc" with out hope. Most likely something that I am doing wrong.
I have managed to:
Click the RunMe bat file
Install USB drivers
Unlock bootloader
When I try step 4 Flash TWRP Recovery I get to the following message: " Did you see the "okay", then congratulations you have flashed in the recovery "
I did not see the Okay message, and when I press THE any key to quit and boot to recovery, nothing happend its just stuck on Fastboot mode.
Please if anyone could help me I would be very greatful!
Kind regards ..
Kissfiss
Click to expand...
Click to collapse
Download the latest stock firmware from http://forum.xda-developers.com/one...rs-official-oxygen-os-roms-ota-t3209863/page9 and flash that using TWRP. Accessing TWRP after flashing it using fastboot is volume down and power. There flash the stock rom, and it should give you a fresh new OP2

Stuck on emergency recovery screen T-380

Hi everyone. While I was attempting to root my tablet I ran in to a problem. It turned out since I had updated to 8.1 it had an RMM state that's prenormal, which makes it impossible to root. I found a guide to use Miracle Box to downgrade it to 7.1 where I'd be able to root. However in this process when I saw Miracle Box was done I decided to unplug the tablet. Well it turns out the tablet was still loading it, so unplugging it caused an error. Now whenever it boots up I'm stuck on the error screen which says to use the emergency recovery mode on smart switch. Well, smart switch won't find my device. Neither will kies. I've tried downloading 2 different stock roms for my exact device and using odin to install them, but I get an error on odin and it fails. I have tried two different versions of odin too, 3.12 and 3.13.
{
"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"
}
Here's the log and error I'm getting.
Here's my tablet screen.
I have no idea what else to do here to get my device back in usable state. Please help!
Smasher39 said:
Hi everyone. While I was attempting to root my tablet I ran in to a problem. It turned out since I had updated to 8.1 it had an RMM state that's prenormal, which makes it impossible to root. I found a guide to use Miracle Box to downgrade it to 7.1 where I'd be able to root. However in this process when I saw Miracle Box was done I decided to unplug the tablet. Well it turns out the tablet was still loading it, so unplugging it caused an error. Now whenever it boots up I'm stuck on the error screen which says to use the emergency recovery mode on smart switch. Well, smart switch won't find my device. Neither will kies. I've tried downloading 2 different stock roms for my exact device and using odin to install them, but I get an error on odin and it fails. I have tried two different versions of odin too, 3.12 and 3.13.
Here's the log and error I'm getting.
Here's my tablet screen.
I have no idea what else to do here to get my device back in usable state. Please help!
Click to expand...
Click to collapse
What error are you getting? There is no picture of your tablet or the error. Also did you try patched Odin? If SmartSwitch won't recognize it do you have the samsung USB drivers installed from here? https://developer.samsung.com/mobile/android-usb-driver.html

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