Soft-Bricked LG GT540 Optimus

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By Ebony Dubois, Junior Member on 23rd August 2014, 10:01 PM
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Hello. I've tried using multiple ROMs in my rooted phone with KDZ Updater, and I guess that one of the updates hanged, or maybe it was something else... I really don't know. What I do know is that my phone currently isn't able to enter recovery mode, and is also not showing any boot logos (neither 'LG' nor 'Android').

I did see some threads about this, one of them talking about starting in Download Mode and using KDZ in CS_Emergency mode with some French ROM. Well, I tried that and as soon as I press "Launch software upgrade" the program freezes until I plug my phone off the PC.

I feel as if something was stuck in my throat and the only way to get it out is by completing this... so any help will be greatly appreciated!

PS: All this happened in the process of trying to install Cyanogen Mod 10.1 (which I did not try yet).
24th August 2014, 01:02 AM |#2  
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Need to make sure to get the right firmware, DLL file, and make sure you have the right port set on the program.
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24th August 2014, 03:12 AM |#3  
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Originally Posted by es0tericcha0s

Need to make sure to get the right firmware, DLL file, and make sure you have the right port set on the program.

Thanks for the reply!

I appreciate the info, and I'll be checking what you've said. All the links in that thread are inaccessible because Fileserve only lets you download what you upload. Anyway, I'm curious as to what this "DLL" file does on a smartphone... why do I need these things? I never heard of them being mentioned anywhere.

I'll start educating myself ASAP. Meanwhile, thank you very much (and by the way, if it's of help to anyone, my phone is a GT540g from Personal, Argentina.
Last edited by Ebony Dubois; 24th August 2014 at 03:35 AM.
24th August 2014, 08:13 PM |#4  
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You're welcome. Sorry, didn't check to see if the files were still there and most every other site just had reposts of the fileserve links. However, finally found what you need here:

I found this dll for your phone but not sure if it works with the firmware you have for that version:

"A dynamic-link library (DLL) file is an executable file that allows programs to share code and other resources necessary to perform particular tasks..."

Basically it ties together a few things in Windows to let the flash tool work for your specific device is my understanding. But they have to be specific to the phone or it won't run once it checks the build.prop of the phone vs the firmware you're trying to install.

Keep in mind, I do not have this phone and have no way to test if they will or won't work so just like any other mod or upgrade - you do so at your own risk.
31st August 2014, 05:24 AM |#5  
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Camera Thanks, but...
First of all, I'm very sorry not to have replied before, but I've been busy. Anyway!
Thanks, I appreciate the links, but I don't understand where to put the .dll file in my phone. I know you'd think I'm an idiot who doesn't know how to use Google, but I actually did search beforehand. I simply don't get where to put it.

Also, if it's worth the shot, I just noticed that I should disable the "Modem" that activates when I plug my phone in. The problem is, KDZ just does this simple log [attached] and states "===FINISHED===" (Note that I have 2 Modems listed in my device manager [attached screenshot])
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Last edited by Ebony Dubois; 31st August 2014 at 05:43 AM.
18th November 2015, 05:26 AM |#6  
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Solution GT540
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:

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.

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

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).

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