Database Users

[q] problems with lg gt540

hi guys.. could you help me with my problem.!
I have an LG GT540 android 1.6 firmware version(stock)
So here are my problems:
1. I tried to upgrade it from 1.6 to 2.1 using this tutorial http://forum.xda-developers.com/show...27&postcount=3 thanks to lavero.burgos for posting it, I was successful at first part, but I cant follow the next because my device wont go to fast boot,, I tried putting it off, then camera+poweron but it doesnt do anything. It doesn't light, no lg logo appears, just nothing although the computer can read the drive when I connect it through usb. So I cannot flash it to 2.3,2.3 because it just wont go to fastboot.
2. When I turn it on normally, It takes long before it response like after 30sec to light, but just light, no lg logo appears although it wasnt bricked because I can use it normally after just waiting to on.(annoying)
3. Since I upgraded it to 2.1, I lost all 3rd party application and the internal apps were the only left, so I copied all my saved apps (.apk) to my sd card but the problem is there is no saved app on my phone to read and install those apps from my sd card.(irritating)
4. My device wont read my sim card, when I start it it says "sim card unprovisioned" so basically I cant connect to mobile networks here in the philippines(im using globe telecom). I feel that Im stucked in the middle of nowhere since I cannot contact and txt all my family and friends.
5. I cant connect to wifi,, when my device detects wi-fi, I try to connect to it but from the log it only try to connect but doesn't obtain the ip address. Even when the wi-fi signal is strong, it does the same thing.
So please help me guys,,I want to hear from my fellow xda-developers badly,,,
PS. also those who have problems with their LG GT540 pls feel free to post and share it with us here... thank you all guys in advance....

hi so let me get it right the phone is working (can turn on and use but cant call) yes? hmmmmm..... try this
MUST DOWNLOAD THIS DRIVERS!!!!
http://dottech.org/android/26188/usb-adb-and-fastboot-drivers-for-windows-for-all-android-phones/
Step one!
1.turn off phone.
2.hold the POWER button till you feel the beep.
3.let go of the POWER button when you feel the beep and hold onto the CAMERA button only.
4.hopefully it turns on to a blackscreen and nothing else(fastboot)
5.unzip this CLICK ME!! to desktop and open the flash all no wipe file
or......
1.turn on your phone.
2.go to settings>applications>development>tick the usb debugging
3.connect phone to computer (make sure phone is on)
4.unzip this CLICK ME!! to desktop and open the flash all no wipe file
5. phone should boot into blackscreen like the one above......
Click to expand...
Click to collapse
Step 2!
both should flash a recovery image. Next
1.make sure the phone is off
2.press POWER button
3.when you feel the beep let go of POWER button and press the HOME button only.
4.phone should boot into recovery mode.
5.take out battery again
6. download a rom into the sdcard using computer
7.go to recovery again using the steps above (steps 1 to 4)
8.select wipe all data factory reset or something like that....
9.install zip from sdcard
10.select from sdcard
11.choose the file you downloaded
12.finish flash and reboot phone.
Click to expand...
Click to collapse

excellent guide! big thanx

bs828 said:
hi so let me get it right the phone is working (can turn on and use but cant call) yes? hmmmmm..... try this
MUST DOWNLOAD THIS DRIVERS!!!!
http://dottech.org/android/26188/usb-adb-and-fastboot-drivers-for-windows-for-all-android-phones/
Click to expand...
Click to collapse
Thanks,, Ive tried the 2nd option on step one and i think my phone successfully got to fastboot(just clean blank screen) so the cmd automatically run and states
C:\Desktop\adb rebootloader
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
error: protocol fault <no status>
C:\Desktop\fastboot flash recovery recovery.img
< waiting for device >
Did I miss something???

ok try again this time with the phone turned on. and then run the script and did you install the drivers?

bs828 said:
ok try again this time with the phone turned on. and then run the script and did you install the drivers?
Click to expand...
Click to collapse
yeah I installed the drivers...

hmmm maybe there are no fastboot drivers(main suspect....) there are a few ways to get it but for mine i just plug my phone in to my pc (windows 7 64bit) it just recognize it and tries to get the "google fastboot interface" drivers from windows update...

Try Volume Up+Search Key+Power to go into Fast boot Mode, There's different keys to activate Fastboot Mode (There is different versions of Fastboot)
Sent from my LG GT540 CM9 PreRC Polish Blood using xda premium

Your phone is/was bricked
Hey, I'm sorry to bing back such an old thread, but I just wanted to say this for posterity: your phone has/had a soft-brick. This means: you can't see Android nor LG boot logos, can't enter Recovery and (maybe) can't access Fastboot, but I'm not too sure on that last one. Besides that, the phone works "okay", but you should try to fix it.
Basically this soft-brick is almost always caught when upgrading from 1.6 to 2.1, so everyone should have it, including me. It took me a whole year to realize how to friggin' fix it lol, but here goes what I did:
Thanks for your help everyone, I came to a solution after a full year lol. Here's my enlightenment, from another Thread:
------------------------------------------------------------------------------------------
Just wanted to leave my 2 cents here, I've been trying to do my best since around august 2014, no success. 2 days ago I retried this, and I DID IT! I will tell everyone what I did very shortly:
My problem that I solved: I can boot, device works like a charm. But: no boot logos, no recovery.
My solution for TL;DR: UNINSTALL ALL DRIVERS FROM DEVICE MANAGER 1ST, then reinstall. After that, flash a fastboot ROM and use it to WIPE ALL THE DATA IN YOUR PHONE! THIS was what I needed and was never explained: you had to WIPE the old data in order to get the boot screens back.
IN THIS ORDER (THANK YOU to those people from previous replies, gathering all your info was of great value):
Uninstall all of your phone drivers from your PC!!! This is what made most of my headaches go away, just use Device Manager and uninstall anything from LGE. After that, plug in your device in your USB ports (always BACK ports, not front ports, important). It should detect all drivers and download them.
IF it fails (it generally does with LGE USB Modem), you can go to Device Manager > Unknown Device (the one that wasn't recognized) > Right Click and Update > Choose 2nd option, then choose "choose from a list of local controllers" (or whatever the button says). After that, scroll down to LG Electronics, Inc. and install what didn't install.
I also found these drivers, but I did not test them: http://www.mediafire.com/download/p693hcz6kkouh19/USB_Driver_LG_GT540.zip
Huzzah!
Now you're set to begin:
FIRST thing you wanna do is a factory reset, this is something I'd forgotten with time, don't make the same mistake as I did. You can do it by turning your phone on and pressing Volume +/- & Home & Quick Search buttons all together for 5 seconds (it works, be patient and wait for it, even if you open the camera or any other stuff).
Download this Google SDK Tools (unzip and put the folder in C:\ drive) and this Fastboot drivers for GT540 (unzip and put the files inside the folder in C:\android-sdk).
Skip this next line if you know your ROM has fastboot.
Now, if you don't have a ROM with fastboot, I recommend you use either European Open+Fastboot or V20C Orange France Fastboot ROM.
Click to expand...
Click to collapse
Since you have Fastboot enabled, now all you need to do is turn off your device (all this with its battery on it, no weird things) and hold the Camera button before turning it back on. This should take you either to a black screen, or simply to no display, like me. Either one will work anyways.
Now press the Windows key > Type cmd and open it with Right Click > Run as Administrator.
In it, type all this, command by command (you can paste by right clicking):
cd C:\android-sdk
fastboot -w
fastboot erase boot
fastboot erase system
fastboot -w
fastboot reboot
Click to expand...
Click to collapse
And now it's go time! Do what everyone else says in here: Take out your phone's battery, SD and SIM cards, fire KDZ Updater up as Administrator (If your KDZ freezes, then it's either faulty or you did not install msxml, look for a good KDZ that comes with that file and delete your current one), choose CS_Emergency PhoneMode and:
1-Plug your phone while holding the volume DOWN button (don't worry! My phone didn't show "Download Mode" either, if you hear the Windows "Somethingpluggedin" Bump noise, it's ok).
2-Flash French V20A
3-Unplug your phone once KDZ says "==FINISHED==".
4-Plug it once again, holding the volume DOWN button.
5-Flash out.kdz (remember! it's CS_Emergency).
Click to expand...
Click to collapse
THANK YOU XDA!
--------------------------------------------------------------------------------------
Also, if you look in here you'll find how to flash an awesome ROM, Cyanogen Mod 10 (should say "Final Version#2).

[HELP] Lg Optimus L3 E400 Bricked [SOLVED]

Hello!
I Tried To Install A Custom ROM But After Its Successful Installation Using CWM When I Rebooted The Fone it didnt booted!
No Key Combinations Work ETC!
But When I Connect it to the pc i hear a sound on windows!
I Also Checked On Device Manager IT Shows Some LGE AndroidNet USb Serial Port(COM15)
Please Help Me! I Don't Wanna Go To The Service Center!
I Bought The Device Like 2 Or 3 years Ago I Don't Remember And Also The Device Is Rooted So Warranty Is Void. Please

AppY.fTw.wOw^ said:
Hello!
I Tried To Install A Custom ROM But After Its Successful Installation Using CWM When I Rebooted The Fone it didnt booted!
No Key Combinations Work ETC!
But When I Connect it to the pc i hear a sound on windows!
I Also Checked On Device Manager IT Shows Some LGE AndroidNet USb Serial Port(COM15)
Please Help Me! I Don't Wanna Go To The Service Center!
I Bought The Device Like 2 Or 3 years Ago I Don't Remember And Also The Device Is Rooted So Warranty Is Void. Please
Click to expand...
Click to collapse
I no longer use this device, so I'm not aware if other users had the same issue like you.
First, did you try searching this forum for similar issues?
If not, it might be a better good place to start.
Second, please explain better whats happening to your phone:
Can you turn it on? If you can, what do you see?
Can you enter recovery mode? (volume down + home + power)
Can you enter emergency mode? (volume up + volume down + power)
Did you try flashing stock firmware with KDZ-flasher?
What ROM did you try to install? Did you check the ROM's page in these forum?

need4steer said:
I no longer use this device, so I'm not aware if other users had the same issue like you.
First, did you try searching this forum for similar issues?
If not, it might be a better good place to start.
Second, please explain better whats happening to your phone:
Can you turn it on? If you can, what do you see?
Can you enter recovery mode? (volume down + home + power)
Can you enter emergency mode? (volume up + volume down + power)
Did you try flashing stock firmware with KDZ-flasher?
What ROM did you try to install? Did you check the ROM's page in these forum?
Click to expand...
Click to collapse
Hello Bro,
When I Try To Turn It On It Vibrates
I Tried To Enter The Recovery Mode But When I Try To Do The Capacative Touch Buttons Light Up For A Second OR Two, The Device Vibrates And Then Again Dead!
Cant Enter Emergency Mode Same Thing Happens Above There ^
Tried To Flash Using KDZ But Device Was Not Found!
I Tried To Install iPhonoid Rom From http://theunlockr.com/roms/android-roms/lg-roms/lg-optimus-l3-e400-roms/
Also When I Try To Connect The Device Through USB I Hear The Sound But It Fails To Install 1 Driver! (USB MTP Device)
When I checked using adb in cmd by the command
Code:
adb devices
i get the list of devices attached and it shows my device there!
Thanks!

AppY.fTw.wOw^ said:
Hello Bro,
When I Try To Turn It On It Vibrates
I Tried To Enter The Recovery Mode But When I Try To Do The Capacative Touch Buttons Light Up For A Second OR Two, The Device Vibrates And Then Again Dead!
Cant Enter Emergency Mode Same Thing Happens Above There ^
Tried To Flash Using KDZ But Device Was Not Found!
I Tried To Install iPhonoid Rom From http://theunlockr.com/roms/android-roms/lg-roms/lg-optimus-l3-e400-roms/
Also When I Try To Connect The Device Through USB I Hear The Sound But It Fails To Install 1 Driver! (USB MTP Device)
When I checked using adb in cmd by the command
Code:
adb devices
i get the list of devices attached and it shows my device there!
Thanks!
Click to expand...
Click to collapse
It's very problematic that you can't enter your device into emergency mode.
I think the only option that is left regarding software is to uninstall all of the drivers that are already installed for you device,
installing the latest drivers from the official site, and then try to use LG Mobile Support Tool to flash stock firmware.
Other than that you can only send it for a hardware repair

need4steer said:
It's very problematic that you can't enter your device into emergency mode.
I think the only option that is left regarding software is to uninstall all of the drivers that are already installed for you device,
installing the latest drivers from the official site, and then try to use LG Mobile Support Tool to flash stock firmware.
Other than that you can only send it for a hardware repair
Click to expand...
Click to collapse
Bro i Tried To Use LG Mobile Support Tool And In Downloading Mode (Remove Battery>Press And Hold Volume Down Button>Plug In USB) It Gets Recognized (Only In Downloading Mode) And Shows The The Device LG E400 Has The Latest Software Installed V20A. When I Try To Use Update Recovery It Downloads A File Of 166.76 MB And Then Starts Installing it But It Gets Stucks @ 4 % For 5-10 Mins And Then The Tool Asks Me To Replug USB Etc And Then Retry But Same Thing Happens!
In Downloading Mode The Device Is Also Recognized By KDZ Updater But While Flashing A Stock Rom I Get An Error Of wParam And lParam!
Please Help!
Thanks

your device not die yet, try use LG support tool again, when it stuck at 4% or above, reboot your phone while plugging in computer. after that, hope it continue processing. this had worked with my fiend's phone

kien_vip said:
your device not die yet, try use LG support tool again, when it stuck at 4% or above, reboot your phone while plugging in computer. after that, hope it continue processing. this had worked with my fiend's phone
Click to expand...
Click to collapse
tnx for the reply ill give it a try :good:
btw how to i reboot? using the power button??

Hey Bros!
I Found That In LG Support Tool It Says The In The Phone The Software Version Installed Is V20A
But There Is No Such Software Version For The Device L3 In LG Firmware Download Page!
But There Is One For LG Optimus L5
So I Guess That I Installed The Rom For L5 To L3 And It Is Bricked Now So Any Solution? o:
Thanks

AppY.fTw.wOw^ said:
Bro i Tried To Use LG Mobile Support Tool And In Downloading Mode (Remove Battery>Press And Hold Volume Down Button>Plug In USB) It Gets Recognized (Only In Downloading Mode) And Shows The The Device LG E400 Has The Latest Software Installed V20A. When I Try To Use Update Recovery It Downloads A File Of 166.76 MB And Then Starts Installing it But It Gets Stucks @ 4 % For 5-10 Mins And Then The Tool Asks Me To Replug USB Etc And Then Retry But Same Thing Happens!
In Downloading Mode The Device Is Also Recognized By KDZ Updater But While Flashing A Stock Rom I Get An Error Of wParam And lParam!
Please Help!
Thanks
Click to expand...
Click to collapse
When saying download mode you're referring to emergency mode?
Do you see in your phone that you're in emergency mode?
AppY.fTw.wOw^ said:
Hey Bros!
I Found That In LG Support Tool It Says The In The Phone The Software Version Installed Is V20A
But There Is No Such Software Version For The Device L3 In LG Firmware Download Page!
But There Is One For LG Optimus L5
So I Guess That I Installed The Rom For L5 To L3 And It Is Bricked Now So Any Solution? o:
Thanks
Click to expand...
Click to collapse
Maybe try what @kien_vip suggested.
And maybe try flashing the right stock version with KDZ-flasher.

need4steer said:
When saying download mode you're referring to emergency mode?
Do you see in your phone that you're in emergency mode?
Maybe try what @kien_vip suggested.
And maybe try flashing the right stock version with KDZ-flasher.
Click to expand...
Click to collapse
Hey,
When i say download mode i mean (Remove Back Cover and Battery>Plug in USB while pressing Volume Down Key!)
As far as i guess we can enter emergency mod by pressing both the volume keys and power key at the same time.
I tried using KDZ but at some point gives me an error of WParam and LParam as I posted above.

AppY.fTw.wOw^ said:
Hey,
When i say download mode i mean (Remove Back Cover and Battery>Plug in USB while pressing Volume Down Key!)
As far as i guess we can enter emergency mod by pressing both the volume keys and power key at the same time.
I tried using KDZ but at some point gives me an error of WParam and LParam as I posted above.
Click to expand...
Click to collapse
Yes, you're right - to enter emergency mode hold volume up + volume down + power
When you're inside you'll see on your screen "EMERGENCY MODE" on a yellow background.
Only the use KDZ-flasher or the lg mobile support tool.
If you're indeed in this mode, then try what @kien_vip suggested above.

need4steer said:
Yes, you're right - to enter emergency mode hold volume up + volume down + power
When you're inside you'll see on your screen "EMERGENCY MODE" on a yellow background.
Only the use KDZ-flasher or the lg mobile support tool.
If you're indeed in this mode, then try what @kien_vip suggested above.
Click to expand...
Click to collapse
I tried to enter the mode but failed!!
The buttons just light up for a second or two then vibrate then again dead.
I Cant Enter Emergency Mode But Download Mode!!!
NO Volume Up+Volume Down+ Power Button
But
YES Volume Down Pressed While Plugging In USB

AppY.fTw.wOw^ said:
I tried to enter the mode but failed!!
The buttons just light up for a second or two then vibrate then again dead.
I Cant Enter Emergency Mode But Download Mode!!!
NO Volume Up+Volume Down+ Power Button
But
YES Volume Down Pressed While Plugging In USB
Click to expand...
Click to collapse
Then all is left for you is to try what @kien_vip suggested previously.

need4steer said:
Then all is left for you is to try what @kien_vip suggested previously.
Click to expand...
Click to collapse
Before entering emergency mode you should remove the battery for a few seconds. Place it back into your phone then enter into emergency mode. Hope this could help you.

Lg update tool uses baseband as the only check whether your device has the latest update. This means you will get the update if you use an older baseband. However, you should try emergency option.

Thanks To All Of You Guys Problem Solved!
Took It To Local Repair Center And Using RIFF BOX JITAG They Solved It!
It Costed Me INR - Rs. 600 Or USD - Around 10 $!
Thanks Everyone! :good:

AppY.fTw.wOw^ said:
Thanks To All Of You Guys Problem Solved!
Took It To Local Repair Center And Using RIFF BOX JITAG They Solved It!
It Costed Me INR - Rs. 600 Or USD - Around 10 $!
Thanks Everyone! :good:
Click to expand...
Click to collapse
Good to know!
Thanks a lot for the detailed information.

hi
I have lg optimus e400, first I flash ICS cyanogenmod then I return to stock ROM....then I discovered a kitkat update and I flash it but due to my vision issues again I returned to stock ROM, until I noticed really odd problem my system memory became smaller, 62MB to be specific, which is usually 125mb free space after a factory reset, I do the reset again and again using factory reset on settings and in the cwm recovery and nothing happens my installed apps is still there ,,other than that many apps stopped unexpectedly and doesn't work anymore (e.g. message, camera, gapps,WAP/mobile data,com.android etc)...
solution I tried:
-factory reset
-ROM reflashing
-clearing data and fix permissions via cwm recovery(this one fix the gapps and com.android force stopped)
any suggestions ....
thanks any effort and help is much appreciated..

allainvillanueva said:
I have lg optimus e400, first I flash ICS cyanogenmod then I return to stock ROM....then I discovered a kitkat update and I flash it but due to my vision issues again I returned to stock ROM, until I noticed really odd problem my system memory became smaller, 62MB to be specific, which is usually 125mb free space after a factory reset, I do the reset again and again using factory reset on settings and in the cwm recovery and nothing happens my installed apps is still there ,,other than that many apps stopped unexpectedly and doesn't work anymore (e.g. message, camera, gapps,WAP/mobile data,com.android etc)...
solution I tried:
-factory reset
-ROM reflashing
-clearing data and fix permissions via cwm recovery(this one fix the gapps and com.android force stopped)
any suggestions ....
thanks any effort and help is much appreciated..
Click to expand...
Click to collapse
Hey, Sorry If im Replying Too Late.
Try Re-Flashing Stock RoM Using Kdz Updater.
This Should Help You! Then If You Want To Root Again Try SuperOneClick Root (Easiest Way) And Install CWM

PLEASE HELPP lg g2 d802 stuck at boot logo

please somebody help my lg g2 stuck at boot logo. i cannot boot to fastboot, recovery or download mode.
when i try to get to download mode i get white screen with some critical error.
DemiGod Crash Handler : critical crash:
Press key to choose Dload Mode or Reboot
1)Volume Up: Dload Mode.
2) Volume Down: Reboot.
If you choose Dload Mode,
Please do following action.
1)Dload Mode. Please connect USB
2) Get the ram dump image using QCT's Memory Debug App
when i chose download mode it stays at this screen and lg flashtools doesn't recognizes it.

I got the same issue, Mine happened when I was using KDZ and I moved my phone but i guess my usb connection went on and off so everything just crashed . I haven't find a fix yet but if I do i'll let you know

anyone have solution to this, i have similar problem

Same issue, my PC doesn't even detect the phone.
Please help !!!

Raiden350 said:
Same issue, my PC doesn't even detect the phone.
Please help !!!
Click to expand...
Click to collapse
this man can help " aftabalam8c2". you have to force your mobile into Qualcomm HS-USB QDLoader 9008 mode.
http://forum.xda-developers.com/lg-g2/general/fix-unbrick-lg-g2-stuck-qualcomm-hs-usb-t2933830

only this

Solution I guess it is here
ilyas111 said:
please somebody help my lg g2 stuck at boot logo. i cannot boot to fastboot, recovery or download mode.
when i try to get to download mode i get white screen with some critical error.
DemiGod Crash Handler : critical crash:
Press key to choose Dload Mode or Reboot
1)Volume Up: Dload Mode.
2) Volume Down: Reboot.
If you choose Dload Mode,
Please do following action.
1)Dload Mode. Please connect USB
2) Get the ram dump image using QCT's Memory Debug App
when i chose download mode it stays at this screen and lg flashtools doesn't recognizes it.
Click to expand...
Click to collapse
Brother I had the same problem yesterday and the pc didnt even detect the lg g2.... The thing is just do like I did listen carefully.
1 / Download LGMobile Support tool and install it quickly
2/ Open that program and click on install drivers ( when drivers are installed just go to the right top corner you will find an " OPTION ' click on it >>> And then click on upgrade recovery and do the process it says until it downloads and finishes )
3/ Go to the phone and enter Dload mode by pressing one the volume UP button and plug the usb cable directly to your device
4/ When the process will be finished you will have your phone healthy ))) and please do not unplug the lg g2 during the process

[Q] I can't enter the download mode.Phone is always open screen is black. QHSUSB_BULK

LG G2 D802
Hello i flashed "Full-CM12-21-03-15-Modem-Bacon-flashable" because of "Error Executing updater binary in zip " with TWRP to my LG G2 D802 by an error .The zip was for oneplus one. i didn't see that. I can't power off my phone. Phone is always open and screen is always black when I insert the cable to pc pc plays hardware plugged vioce this is the only thing that works. The phone seems "QHSUSB_BULK" in the device management but i cant see it at disk management list. I tried everything the phone is still waiting open position . How can i enter download mode or any other method to fix my phone? Please Help

Long press on power button till phone is off. Then enter to the recovery and try to install another Rom. if you have OTG memory, use it.

it doesn't work pc see phone as "QHSUS_BULK"
sanguchez_sdd3 said:
Long press on power button till phone is off. Then enter to the recovery and try to install another Rom. if you have OTG memory, use it.
Click to expand...
Click to collapse
it doesn't work pc see phone as "QHSUS_BULK"

Take a look at this http://forum.xda-developers.com/lg-g2/general/unbrick-lg-g2-qhsusbbulkqualcomm-9006-t2939627 hope it works.

[HELP] LG G2 can not open (stay at logo) (TWRP can't open - boot certification error)

Hello my friends.
I installed CloudyG2 3.3 to my LG G2. And on this morning, my phone closed. I tried to open but, i can't. The screen stayed at LG logo screen. So i tried to do Hard Reset with buttons. I said Yes-Yes but there was something wrong.. A mistake. (boot certification error) I can't enter TWRP screen.
I tried to install stock rom with Flash Tool. But i can't.. Again.. Because it stuck at %2..
So i can't install stock rom and i can't open my phone. Can anybody help me?
Sorry my bad English.

cemre17 said:
A mistake. (boot certification error) I can't enter TWRP screen.
I tried to install stock rom with Flash Tool. But i can't.. Again.. Because it stuck at %2..
Click to expand...
Click to collapse
First of all power of your phone by long pressing power button until screen light goes off completely
Then keep pressing volume + button and connect it to PC via USB cable. [DOWNLOAD MODE]
Now you must be in download mode, simply flash stock firmware.
If you can't enter download mode then you might be in fastboot mode.
here are some threads..find out which one is related to your problem follow instructions carefully.
[HOW TO] Fix your soft-bricked LG G2 (All Variants)
OR
[FIX] NO Recovery mode, No download mode, after OTA on rooted LG G2
OR
LG G2 is UNBRICKABLE NOW! [FIX REAL HARD BRICK
As you mentioned that you were running a custom ROM prior to this problem then I'm sure that you need not to visit following thread.
Refurbished phones and a few words of caution
Good Luck...!

KASHYAP9 said:
First of all power of your phone by long pressing power button until screen light goes off completely
Then keep pressing volume + button and connect it to PC via USB cable. [DOWNLOAD MODE]
Now you must be in download mode, simply flash stock firmware.
If you can't enter download mode then you might be in fastboot mode.
here are some threads..find out which one is related to your problem follow instructions carefully.
[HOW TO] Fix your soft-bricked LG G2 (All Variants)
OR
[FIX] NO Recovery mode, No download mode, after OTA on rooted LG G2
OR
LG G2 is UNBRICKABLE NOW! [FIX REAL HARD BRICK
As you mentioned that you were running a custom ROM prior to this problem then I'm sure that you need not to visit following thread.
Refurbished phones and a few words of caution
Good Luck...!
Click to expand...
Click to collapse
Thank you my friend for all your answers. In substance;
I can't open my phone. (Staying at LG logo screen.)
I can't do "Hard Reset" with phone buttons. (Because of "boot certification error" screen.)
I can enter "Download Mode" but I can't loading any .KDZ file with Flash Tool. (Stuck at %2)
My computer can't see my phone when I plug that.
Very hard situation. :crying:

cemre17 said:
Thank you my friend for all your answers. In substance;
I can't open my phone. (Staying at LG logo screen.)
I can't do "Hard Reset" with phone buttons. (Because of "boot certification error" screen.)
I can enter "Download Mode" but I can't loading any .KDZ file with Flash Tool. (Stuck at %2)
My computer can't see my phone when I plug that.
Very hard situation. :crying:
Click to expand...
Click to collapse
Reinstall LG drivers and PDA
then connect phone with PC in download mode.
open device manager and search for 'COM ports' list if you see your device there then you are ready to go.
If your device is not there then search under 'Other devices' and manually install drivers.
If you can boot into download mode and still you can't see your device in your PC then it's not problem with your G2. It's your PC which is causing it all.
Try another PC.

KASHYAP9 said:
Reinstall LG drivers and PDA
then connect phone with PC in download mode.
open device manager and search for 'COM ports' list if you see your device there then you are ready to go.
If your device is not there then search under 'Other devices' and manually install drivers.
If you can boot into download mode and still you can't see your device in your PC then it's not problem with your G2. It's your PC which is causing it all.
Try another PC.
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I reinstalled LG drivers, and i can see "LGE Android MTP Device" in Device Manager and it has no problem. (There is no yellow exclamation mark) But still, my computer can't see my phone. And i tried install stock rom with Flash Tools again but i did not work. Stuck at %2 again.