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!

LG G2 F320L stuck in Boot Loop not going in download mode

hi guys,
i flashed recovery using the manual method from this thread http://forum.xda-developers.com/showthread.php?t=2468858.
I wasn't able to use the last command
Code:
rm /sdcard/g2_security
I thought it didn't work , i also updated the my phone software.
When my phone restarted it went to cwm and now its stuck there.
Now when I try to boot I can either get in CWM or some Korean Recovery Menu with three option (i tried all nothing happend) or just stuck in boot loop!
I can't get in download mode by pressing vol up and plugging usb cable (tried all possible methods)
I will be glad if someone can help me out.
Thanks in advance

That's an unexpected situation to say the least.
So in short: installation of recovery worked, but you lost access to your ROM.
Correct?
Now, if you had a flashable ROM on your sd card you would be sorted, no?
I would say, get any compatible ROM, put them on a micro sd card and plug them into your phone. Flash through cwm...
Am I misunderstanding?
Otherwise there is always the fully back to stock option:
http://forum.xda-developers.com/showthread.php?t=2475045

Zentac said:
That's an unexpected situation to say the least.
So in short: installation of recovery worked, but you lost access to your ROM.
Correct?
Now, if you had a flashable ROM on your sd card you would be sorted, no?
I would say, get any compatible ROM, put them on a micro sd card and plug them into your phone. Flash through cwm...
Am I misunderstanding?
Otherwise there is always the fully back to stock option:
http://forum.xda-developers.com/showthread.php?t=2475045
Click to expand...
Click to collapse
I was able to fix my phone using this thread. I was able to get in recovery but not in download mode. After executing these commands I flashed stock firmware through LG flashing tools.

aatish said:
hi guys,
i flashed recovery using the manual method from this thread http://forum.xda-developers.com/showthread.php?t=2468858.
I wasn't able to use the last command
Code:
rm /sdcard/g2_security
I thought it didn't work , i also updated the my phone software.
When my phone restarted it went to cwm and now its stuck there.
Now when I try to boot I can either get in CWM or some Korean Recovery Menu with three option (i tried all nothing happend) or just stuck in boot loop!
I can't get in download mode by pressing vol up and plugging usb cable (tried all possible methods)
I will be glad if someone can help me out.
Thanks in advance
Click to expand...
Click to collapse
The same exact thing happed to me. did u fix it, if yes can you please tell me how??

I have the same issue. Nothing mentioned in other threads is useful just because I CAN'T ENTER DOWNLOAD MODE. Totally stuck Help! Devs! Anyone!

Try installing some custom rom from recovery...after installing custom rom you can enter into download mode and do whatever u want...return to stock using kdz files or anything else..

[Q] Unbrick L7 p708

This is a different brick, I flashed a baseband v20 for L5 on the L7, when I rebooted there was only a iluminated black screen, the problem is that I can't enter on any SW/Upgrade, recovery, emergency mode etc. I'm only able to flash with fastboot, but I haven't find a way to reflash baseband or whatever to unbrick my L7.
Could you giveme something to flash and runbrick my L7?
PD: When I try to flash System.img it says "File too large"

Oh I think there is no way... To flash a new baseband you must can boot into recovery... Did you tried CWM on PC?

No
TheAvngrZ said:
Oh I think there is no way... To flash a new baseband you must can boot into recovery... Did you tried CWM on PC?
Click to expand...
Click to collapse
No, how can I do that? do I have to turn on the phone? Because it doesn't enter on any mode, just fasboot

I'm sorry, I can't help you by that thing. Seek for CWM and PC I dont know how to do it...

Enter into the Emergency Mode. By Removing the Battery & Connect to the Charger & Press home+Power+Vol up.Then Flash the ROM again

Thanks, problem solved.
Thanks to everyone, the problem was that I couldn't see when it was on emergency mode, the screen never showed me anything, because it was only in black, anyway, I tried all combination buttons until I fount that vol down+put usb without battery installed new drivers on Windows 8, then finally I could flash stock. Again thanks.

Bootloop problem, no recovery, no download mode (Non rooted and No custom recovery)

Hi, I just bought an LG G2 D802 20B Model a couple days ago, yesterday I wanted to downgrade to 4.2.2 and I ended up bricking the phone.
The phone is non rooted, doesn't have any custom recovery, and not recognized by adb even though i installed all the drivers ( koush drivers, PdaNet, Lg drivers ...)
At first I flashed with .kdz file and it ended in bootloop, I tried to factory reset but it doesnt have any effects with the stock recovery it only shows the green android bot and blue progress bar and then restart in 3 seconds and reboots to lg logo and start looping.. After a restart the download mode didn't work anymore it showed me fastboot error, I searched for the tutorial that actually worked and I flashed with .tot method but there is still bootloop and the download mode is stuck at the image attached. The phone is not recognized by neither windows or ubuntu therefore I can't use adb to fix the partitions.
Can any body provide me with a solution? The phone is still new and it will be a shame if its transformed to a brick in 3 days :crying:​

Hey..hmm i think thats how download mode it is...so did you tried to flash again a firmware?

raulx222 said:
Hey..hmm i think thats how download mode it is...so did you tried to flash again a firmware?
Click to expand...
Click to collapse
Actually the picture attached is stuck and it doesnt change , and the pc can't recognize the phone so I cant flash it with another firmware

BUMP! please help!!

This isn't download mode.
here
only aboot, boot, laf..

bender_007 said:
This isn't download mode.
here
only aboot, boot, laf..
Click to expand...
Click to collapse
Thanks for your reply, however the phone is not recognized on windows neither on ubuntu therefore this tutorial can't help ...

I am in the exact same situation.
Mine is a D802 32GB Hong Kong model. I stupidly ran AutoRec which soft-bricked my phone. Managed to get Download Mode working, then flashed 20C and 20B which bootlooped. Then I attempted to flash 10B, which got me into this exact state:
Download Mode not working (only shows "Download Mode", does not go to firmware recovery screen, not detected in Win/Linux)
Factory reset (Power + Vol Down) can go to factory reset screen, after factory reset, still bootloop.
Once in a while, I also get the Android icon which then disappears after a few seconds and goes to LG logo again.
If I plug the phone in and do a factory reset, Windows detects the LGE AndroidNet modem, and Linux will detect cdc_acm USB Abstract Control Model driver. Flash Tool and LG Mobile Support seems to detect the phone and attempt to flash, but the phone restarts after a short while.
I have no idea what else to do

boot loop

I Tried To Flash Twrp On My Grand 2 And Rebooted The Device And Its Stuck On Boot Loop, From Then On When I Placed The battery The Phone Automatically Switches On and then Starts To Reboot. I Tried To Get Into Download Mode But It Shows Up For A Second And Then Reboots , The Same Happened Everytime When I Tried To Boot Into Recovery And Download Mode. Please Help Me Guys I Cant Use My Phone Since 20/2/17. Pls Hlp !!!!!!

I think your device is bricked

Is your phone pluged-in to your comp when you got into bootloader ? Also try reinstall drivers for samsung & odin.