Database Users

[Q] Flash stock with security error

Ok, so I flashed cleanrom ex, and on reboot I got a security error.
I tried to get to recovery, but it wipes data and immediately reboots.
I've tried flashing the stock rom, but lg flash tool tells me it's the wrong device (now thinks it's a D802).
I've been trying to get into TWRP on scrosler and samsunggalaxystig's advice, first by repeatedly trying an adb reboot recovery, then by writing a batch script to do it repeatedly in order to catch it before it reboots.
Problem is, I don't know if I had already had ADB drivers installed on this computer for the G2 (had rooted while at work), and despite installing them more than once, I don't think the device actually has enough time to be recognized as I still have an unrecognized "g2" in device manager while TWRP is wiping.
Any ideas? Is there any way I can force the install of the ADB driver without having it connected for more than 20 seconds? Spitballing... would it be possible to actually flash a D802 image so I could then root, change the build.prop to D800, and then flash the D800 image?
Totally at a loss at this point.

did you solve your problem? i have a similar problem and i just bricked an s3. this g2 is brand new and now it's bricked too! if you have found a solution please respond... :crying:

kureta said:
did you solve your problem? i have a similar problem and i just bricked an s3. this g2 is brand new and now it's bricked too! if you have found a solution please respond... :crying:
Click to expand...
Click to collapse
No problem if you brick a sammy phone. its easy to flash stock rom. How did you brick your g2?
---------- Post added at 08:13 PM ---------- Previous post was at 08:11 PM ----------
lastdeadmouse said:
Ok, so I flashed cleanrom ex, and on reboot I got a security error.
I tried to get to recovery, but it wipes data and immediately reboots.
I've tried flashing the stock rom, but lg flash tool tells me it's the wrong device (now thinks it's a D802).
Totally at a loss at this point.
Click to expand...
Click to collapse
Why did flashing a rom leads you to that error? Sorry but not familiar with your roms but is this rom really for your LG G2 model?

lastdeadmouse said:
Ok, so I flashed cleanrom ex, and on reboot I got a security error.
I tried to get to recovery, but it wipes data and immediately reboots.
I've tried flashing the stock rom, but lg flash tool tells me it's the wrong device (now thinks it's a D802).
I've been trying to get into TWRP on scrosler and samsunggalaxystig's advice, first by repeatedly trying an adb reboot recovery, then by writing a batch script to do it repeatedly in order to catch it before it reboots.
Problem is, I don't know if I had already had ADB drivers installed on this computer for the G2 (had rooted while at work), and despite installing them more than once, I don't think the device actually has enough time to be recognized as I still have an unrecognized "g2" in device manager while TWRP is wiping.
Any ideas? Is there any way I can force the install of the ADB driver without having it connected for more than 20 seconds? Spitballing... would it be possible to actually flash a D802 image so I could then root, change the build.prop to D800, and then flash the D800 image?
Totally at a loss at this point.
Click to expand...
Click to collapse
Hey I'm in the exact same position as you... did you manage to figure out a way to get into recovery?

kureta said:
did you solve your problem? i have a similar problem and i just bricked an s3. this g2 is brand new and now it's bricked too! if you have found a solution please respond... :crying:
Click to expand...
Click to collapse
twrp corrupted my cache partition and the phone could not boot. i tried to flash cwm while in twrp and i guess i messed up recovery and/or boot partitions. al i could get was fastboot. i flashed a boot.img i got from somewhere in here. now it says security error and it does not boot. it does not enter into fasboot. i can enter into recovery mode but it is the stock lg recovery and if i choose "delete all data", which is the only option, it gives an error and restarts.
if i try to flash stock firmware as described in this post it stops at 49%.

kureta said:
twrp corrupted my cache partition and the phone could not boot. i tried to flash cwm while in twrp and i guess i messed up recovery and/or boot partitions. al i could get was fastboot. i flashed a boot.img i got from somewhere in here. now it says security error and it does not boot. it does not enter into fasboot. i can enter into recovery mode but it is the stock lg recovery and if i choose "delete all data", which is the only option, it gives an error and restarts.
if i try to flash stock firmware as described in this post it stops at 49%.
Click to expand...
Click to collapse
I am on the same boat, same problem, and don't know what else to do...hope someone could help us out.

Yep me to same issue. Pretty much tried 6 different methods and still stuck

Solution
IF you still have guys this issue i have solusion for you .
This happened to me yesterday too
1. Download ADB drivers for LG G2 LINK
2. Download LG Mobile Support Tool you can find this here LINK
3. HOLD VOLUMEUP + POWER button to enter the download mode and connect your device to pc
4. Run LG Mobile Support Tool ( if your device vas found click settings select upgrade firmware this will download for you 1.9 GB STOCK FIRMWARE
5. Enjoy your mobile

Any luck anyone? I can't get the suggestion in the last post to work because my phone just goes from the LG Logo to Security Error. I can't get to download mode. Or recovery. Or get ABD to see it.

Odd
quatrix1 said:
IF you still have guys this issue i have solusion for you .
This happened to me yesterday too
1. Download ADB drivers for LG G2 LINK
2. Download LG Mobile Support Tool you can find this here LINK
3. HOLD VOLUMEUP + POWER button to enter the download mode and connect your device to pc
4. Run LG Mobile Support Tool ( if your device vas found click settings select upgrade firmware this will download for you 1.9 GB STOCK FIRMWARE
5. Enjoy your mobile
Click to expand...
Click to collapse
i have to choose upgrade recovery and it gets past analyzing then doesnt show a bar for downloading software...

HELP!!!!!!!!!!!!!!!!!!!!!
Can someone help me I successful in installing twrp though autorec apk and the same for rooting my g2. I flashed cm with nightlies and noticed that twrp had a update. I downloaded the zip and try flashing it like flash a recovery in flashify but that din't work and readed that zip flashing though twrp didn't work but renumber this video and though it would update my recovery to 2.7.1 but it was successful in doing so but when I got to recovery it was 2.7.0. That not the problem form there I tried to boot into my system. Then it turn off though that I passed power off instead but when turn my g2 back on I found that I had a security error show up then turn back off. So can someone help show me a tutorial on unbick or a way to remove error. Also I have the d800 and i have some idea without going though unbicking a hard factory rest or flasing twrp form there site in fastboot. Finally that lg mobile support tool say that im up to date. I think doing the autorec twrp recovery locked as my phones recovery like trying to flash a rom with a locked bootloader.

Ok guys i trying to help cause it happen to me too,sorry for my english too slow but i try,when you try go twrp with volume up+power buttom it still show security errow,that ok your device not hardbrick yet,when you try volume down+power buttom it show hard reset it does mean it clear all rom,picture in internal but it go to twrp again,and them just flash another rom in your device and it done,have great day piece

I had the same problem on my G2 was using twrp to flash cyanogenmod not sure what i did and phone rebooted to show security error message. I entered recovery mode (power and volume down release when logo pops up and press power and volume down again hold for a second then tap both buttons a few times) pulled up the option to factory reset so i did and it booted me into twrp and allowed me to flash cyanogenmod correctly this time and the phone started back up with no problems. hope this can help someone else as well.

Anybody know the solution?
I also have the security error boot loop after flashing KK baseband files... I tried to enter recovery mode by holding vol down & power button but it wont work...
it does work when i enter download mode (vol up + power button), but i don't want to have to download the stock LG ROM..
anybody know how to by pass the security error boot loop to allow me to reflash?

kureta said:
did you solve your problem? i have a similar problem and i just bricked an s3. this g2 is brand new and now it's bricked too! if you have found a solution please respond... :crying:
Click to expand...
Click to collapse
if you still bricked. try this
get your tools from here: http://forum.xda-developers.com/showthread.php?t=2432476
keep reading or follow above thread. both will work.
best of luck.
After all the drivers installed correctly
make sure your phone is connected to the
com41 port change it if it already not ( Under device manager > Go to Ports (COM & LPT). You should see LGE AndroidNet etc... Right click it and go to Properties > Port Settings > Advanced > Change COM Port Number to COM41 > OK > OK > Close Device Manager )
run flash tool
1. choose type CDMA
2. chose PhoneMode: DIAG
leave rest as it is.
3. choose your kdz file.
then go to download mode
1. power off
2. press and hold vol + key and plug usb cable
3. done )
We have go 2 flashing modes.
1. Normal Flash is for flash with keeping data
2. CSE flash is totally new start preffered.
hope this helps.

thanks but it was a long time ago and I further messed up things, ended up sending it for warranty. they have replaced the device.

me too messed up my cell 1st i was on cloudy g2 v2.1 installed cm11 nightlies but the camera was not so good so then installed cloudy g2 v2.1 n since then i was having problem regarding sound during call and also some hard noise like siren starts randomly, i searched alot but didnt got any solution. wiped all many times (including internal storage ). but no luck then i thought i might be baseband error so i just downloaded auto recovery n flashed it n then stuck into security error but thank GOD i had custom rom in my sd card that time i flashed it back but still em having the sound error.

lastdeadmouse said:
Ok, so I flashed cleanrom ex, and on reboot I got a security error.
I tried to get to recovery, but it wipes data and immediately reboots.
I've tried flashing the stock rom, but lg flash tool tells me it's the wrong device (now thinks it's a D802).
I've been trying to get into TWRP on scrosler and samsunggalaxystig's advice, first by repeatedly trying an adb reboot recovery, then by writing a batch script to do it repeatedly in order to catch it before it reboots.
Problem is, I don't know if I had already had ADB drivers installed on this computer for the G2 (had rooted while at work), and despite installing them more than once, I don't think the device actually has enough time to be recognized as I still have an unrecognized "g2" in device manager while TWRP is wiping.
Any ideas? Is there any way I can force the install of the ADB driver without having it connected for more than 20 seconds? Spitballing... would it be possible to actually flash a D802 image so I could then root, change the build.prop to D800, and then flash the D800 image?
Totally at a loss at this point.
Click to expand...
Click to collapse
kureta said:
did you solve your problem? i have a similar problem and i just bricked an s3. this g2 is brand new and now it's bricked too! if you have found a solution please respond... :crying:
Click to expand...
Click to collapse
k2thejx5 said:
Yep me to same issue. Pretty much tried 6 different methods and still stuck
Click to expand...
Click to collapse
Hey guys, I was in the same boat for a little but was able to fix it by downloading the 801C firmware and flashing it. The firmware file should be a KDZ extension and you should also download LG Flash Tool 2014. Turn the phone on by holding the Power button and Volum up while it is plugged into your computer(It has to be plugged into a computer with LG phone drivers or it won't work).
Follow this tutorial and you will be set.
http://www.droidviews.com/how-to-restore-lg-g2-to-stock-firmware/
Start at step 17 on Method 1 and you should be golden.
Hope this helps guys!

[Q] Help with bricked g2

I'm sorry if there is a post for this already, I have been using this website for a while and until now never had to post because all my questions were answered. This time I am not able to find an answer or even a thread with the same circumstances as mine. I rooted and installed a custom rom but didn't like it. I tried going back to stock but accidentally wiped the phone so the backups and the roms were gone. I had TWRP installed but it wouldn't allow me to sideload via adb and when I tried to enter download mode, it would enter it but go to a screen that just said firmware update and stayed stuck on there. So I went out and bought a OTG usb cable to read the rom off a flash drive and I installed it but now instead of going to recovery it goes to a black screen that just says fastboot mode udc start. Download mode still does the same firmware update screen. Any help would be appreciated, thank you.

What rom did you try to install what software version were you on
Sent from my VS980 4G using Tapatalk

spinninbsod said:
What rom did you try to install what software version were you on
Sent from my VS980 4G using Tapatalk
Click to expand...
Click to collapse
I'm on the latest software and I tried to put the newest stock I could find but honestly I might've made a mistake since my PC is loaded with different roms and files from all kinds of phones and software versions.

same problem here,,, i was going to open a thread but i jumped on this one. Let me explain what i did,
i was running ls980 zv8 clodyflex 1.4 jellybean and i went to recovery TWRP wiped everything exept internal storage flashed kk baseband and ZVA radio then flashed cloudyflex 2.2 and rebooted and phone went to the same screen as the owner of this thread: fastboot mode udc start and i cant get in to recovery to restore my backup. Ive tried lg tools method to flash a tot firmware but even having all drivers it doesnt happend, i tried fastboot method with command prompt to flash recovery twrp again and no luck either, i ran out of options here but there is gotta be a solution for this PLEASE HEEELP!

smallyetzon said:
same problem here,,, i was going to open a thread but i jumped on this one. Let me explain what i did,
i was running ls980 zv8 clodyflex 1.4 jellybean and i went to recovery TWRP wiped everything exept internal storage flashed kk baseband and ZVA radio then flashed cloudyflex 2.2 and rebooted and phone went to the same screen as the owner of this thread: fastboot mode udc start and i cant get in to recovery to restore my backup. Ive tried lg tools method to flash a tot firmware but even having all drivers it doesnt happend, i tried fastboot method with command prompt to flash recovery twrp again and no luck either, i ran out of options here but there is gotta be a solution for this PLEASE HEEELP!
Click to expand...
Click to collapse
I just saw this. I have done the same thing. But I have been able to recover with TOT file. The trick to enter download mode is to hold the volume up button when you power on the phone. If you can get the phone to stay off, then hold volume up, while holding vol up plug in your data cable. You should get DL mode. If you do this while the LG Flash Tool is open, then go to control panel and find the COM port for the LG phone, open properties and advanced, change the COM port to COM41. Once that is done, also once the flash tool files are loaded and the COM41 box says ready, unplug your phone then replug your phone. You may have to also hold volume down here, I can't remember. But the first time is to let the drivers configure. The second time lets the flash tool see the COM port and it should start flashing. It will get around 80% and reboot. The flash is done and the tool will eventually report an error.
I installed the KK baseband as instructed, even also came from the stock ZVC update, rooted via IORoot25. It's a shame as I've heard great things about this ROM.
Hope that helps.

[FIX] NO Recovery mode, No download mode, after OTA on rooted LG G2
I know you guys didn't brick doing the OTA, but it might help: [FIX] NO Recovery mode, No download mode, after OTA on rooted LG G2
I was in the IRC channel when it happened, hehehe...
Good luck!
Compass.

Help: fastboot secure booting error

evidently I've screwed up something on my vs980. When I try to boot to recovery I get a fastboot screen with "secure booting error Cause: boot certification verify.
A little background:
I had been running Optimus g3 then flashed xdabbeb 982.5 (following all steps).
After that I thought I'd give AICP a try. after flashing the radio all was good.
I think this is where things got bad: I flashed 24a radio and restored an optimus backup, saved some stuff then restored xdabbeb 982.5. At this point I got a bootloop and dirty flashed 982.5 on top of the backup - problem solved.... until yesterday when I tried to boot to recovery and got the error.
My phone is working fine but I cant get to recovery.
Anybody got ideas?

hmm dunno..maybe try flash a recovery again? or push from adb recovery files dunno... you can even try use autorec app again to flash a recovery Oo maybe this works and after you can get in recovery
so you can try auto rec in order to flash recovery again .
you can enter download mode and go back to stock with kdz
or hmm you can use fastboot if you know how to push files etc etc
http://forum.xda-developers.com/showthread.php?t=2477595
http://forum.xda-developers.com/showthread.php?t=2277112
http://forum.xda-developers.com/showthread.php?t=2317790
lots of reading.. but if you have download mode then kdz back to stock will work for sure... thats why im scared to change baseband....many strage things can happen /scared..well gl .its not brick so you will get it back working soon)

[Q] Ruined Fastboot mode, but regular boot works?

Okay, so not sure what I did here.
I have an LG G2 ATT version with 4.2.2 installed.
I was trying to install CM, which I already have on my Nexus 7 and love. But the LG G2 doesn't have a nice one-click install app like the Nexus 7 does.
So, I managed to root it, and got SuperUser installed and Clockworkrecoverymod.
At one point I also had TWRP installed, and I think that is where I went wrong. I went to flash a new fastboot / recovery mode and think I selected the wrong one (LG G2 International).
Ever since then, attempting to reboot into recovery using the hardware method (volume down + power) doesn't work. If i force it into fastboot mode using Clockworkrecoverymod or ioroot, I get a strange message.
All the phone shows is white text on a black background:
[830] Fastboot mode started
[940] -- rest --
[950] fastboot; processing commands
then, if i unplug the USB port, I get a few messages. If I replug it in, I get the above message again, with different time stamps.
If I boot normally, it pulls up the normal stock OS, but any attempt to boot into fast mode gets me this message. I can also boot into download mode, but it hangs at 0 %. I tried Flashing a new Recovery using clockworkmod, and it says it worked, but booting into recovery just results in ending up in the same Fastboot mode deadend.
I see the same message if I try to factory reset the phone through the normal software method in options.
So, it is great that I didn't completely brick my phone when I idiotically installed for the wrong mode, but without being able to get into fastboot mode, what are my options for getting back on there and back to stock so I can try again?
And yes, I tried to make a backup on my device, but when I went to go back to it, clockworkmod said it isn't there. Not sure how I messed that up, but anyone have any suggestions on what I can do going forward?

As I understand; If you're trying to boot it to recovery mode, it goes to fastboot mode, right?
If I understood right; you need just flash recovery to your device.
G2 has a different boot process from other devices. If bootloader failed to boot the thing you want to boot, it goes to fastboot mode. That's why it goes fastboot mode when you try to boot it to recovery.

Ah yeah, i just couldn't figure out how to get it out of Fastmode. I was a little confused about the difference between fastmode and recovery.
I seemed to have fixed the problem by AutoRec, for whatever that is worth. Now it boots into TWRP's recovery mode. Shouldn't be hard to get cyanogenmod now.

TheAmericannomad said:
Okay, so not sure what I did here.
I have an LG G2 ATT version with 4.2.2 installed.
I was trying to install CM, which I already have on my Nexus 7 and love. But the LG G2 doesn't have a nice one-click install app like the Nexus 7 does.
So, I managed to root it, and got SuperUser installed and Clockworkrecoverymod.
At one point I also had TWRP installed, and I think that is where I went wrong. I went to flash a new fastboot / recovery mode and think I selected the wrong one (LG G2 International).
Ever since then, attempting to reboot into recovery using the hardware method (volume down + power) doesn't work. If i force it into fastboot mode using Clockworkrecoverymod or ioroot, I get a strange message.
All the phone shows is white text on a black background:
[830] Fastboot mode started
[940] -- rest --
[950] fastboot; processing commands
then, if i unplug the USB port, I get a few messages. If I replug it in, I get the above message again, with different time stamps.
If I boot normally, it pulls up the normal stock OS, but any attempt to boot into fast mode gets me this message. I can also boot into download mode, but it hangs at 0 %. I tried Flashing a new Recovery using clockworkmod, and it says it worked, but booting into recovery just results in ending up in the same Fastboot mode deadend.
I see the same message if I try to factory reset the phone through the normal software method in options.
So, it is great that I didn't completely brick my phone when I idiotically installed for the wrong mode, but without being able to get into fastboot mode, what are my options for getting back on there and back to stock so I can try again?
And yes, I tried to make a backup on my device, but when I went to go back to it, clockworkmod said it isn't there. Not sure how I messed that up, but anyone have any suggestions on what I can do going forward?
Click to expand...
Click to collapse
if you want go back to stock and you can't enter in download mode you can try follow this but USE THE CORRECT FILES FOR YOUR DEVICE!!!!!!!!
http://forum.xda-developers.com/showthread.php?t=2477595
to extract laf.img from kdz.
http://forum.xda-developers.com/showthread.php?t=2600575
Give a thank to the OP of the threat.

[Q] Phone working fine but no Download/Recovery

Hello guy's,
i have quiet a strange issues with my lg g2
I was on Cloudy flex (Kitkat) with my rooted G2 and wanted to try out the new Lollipop Cloudy ROM.
So i flashed it using TWRP.
It did not work and i Realized that i should have bin on Android 5.0 stock before flashing.
So i went back to 4.4.2 Stock ROM using the LG flash Tool and a kdz file.
Now the Phone is working fine, but there is no way to got to Download or Recovery mode anymore.
I did not expect TWRP to be installed anymore but i don't even have the stock Recovery and much more important no download mode.
Can somebody help me?

Try quickboot to boot to recovery.
what variant are you on ?

bender_007 said:
Try quickboot to boot to recovery.
what variant are you on ?
Click to expand...
Click to collapse
d802
i think i bricked it now!
i was able to root the device and i installed Flashify.
Than i flashed laf.img with flashify according to that FIX: http://forum.xda-developers.com/showthread.php?t=2706590
Now i cant do anything regardless of what i do the LG logo comes up and stays there for ever.
Even when i plug in the USB cable only the LG Logo pops up.
At least i can still see it in device manager but i can not find it in CMD using that instruction:
http://forum.xda-developers.com/showthread.php?t=2477595

Nobody an idea?
Because i ran out of them!

Well you are doing stuff on your own m8.
You will get a secure brick this way.
More info needed..what is your device recognized as ?