[Optimus L3, L5, L7 Q&A, Help & Troubleshooting] Cydes:
Hello XDAers,

I am a real noob at rooting or android-related, and a true one voided of any knowledge regarding anything IT- related.

So dear veterans, please go easy on me.

Due to my prior success of rooting and flashing my Nexus 4 successfully a few months back with no issues, I decided to give it a try to flash a custom ROM for my dad's LG Optimus L7 - which seemed an easy task compared to configuring my Nexus 4 - since there was no need for inputting any command lines or any dealing with the abd (using the easy shortcut, that is).

So, I followed the guide here: http://xdaforums.com/showthread.php?t=1906133 ...

I first factory resettled the phone because it was bloated, then applied the "RunMe.bat" from the "What you desire!" folder. (Everything was already backed-up beforehand.) But the process didn't success until I've retried again and again by re-plugging the USB in because the application/PC couldn't detect the phone. In the same time, I was running KDZ_FW_UPD.exe in the background, so unexpectedly for me the phone shut itself and pushed itself to a vividly green emergency screen, then in a few seconds switched back to a screen of purple-white-blue glitches. I had to close KDZ_FW_UPD.exe without knowing what quite happened since it seemed to be the cause and restarted the process with RunMe.bat.

I didn't manage to "Restore" it first due to the fact that the phone stopped responding due to a lag asking for an encryption key. It was lagging so hard and I had to close the cmd around 5 tries while it was processing, but succeeded later on.

And then, to verify whether I've actually suceeded in rooting L7, I installed Root Checker from the Play Store. And again, for the first few tries the program froze on screen for a long period of time due to "system performance", but after rebooting and restarting the app a few times again, the ROOTING proves to be a success. Just to be sure, around this time I've reloaded KDZ_FW_UPD.exe and it suceeded.

So I went to install CWM and ES. CWM for recovery boot and ES for removing pre-installed system apps as the phone was lagging so badly. I've downloaded the CWM restoring(something like ~6.0.28?) first and tried fastbooting immediately right after, but instead of getting the fastboot menu I got a screen emptied in black with these words:

[5020] "Secure booting error"

[5020] "Cause: boot certification verify"

No hard keys could do anything on the presumed "fastboot", and so I had to hard boot again. I thought that it might be due to the lack of memory(checked on ES later on that it was 310~MB/2GB), and so I've used ES to uninstall a lot of system apps which I deemed uneccessary. So I've Googled a bit and it became apparent to me that that I've didn't unlock the device properly, so lurked around and found a file called L7CWM that is supposedly to resolve my problem, but I presume that it's the CWM recovery image that I've installed. So in the end, I didn't bother with it but kept it on tab just in case.

I repeated the same process with CWM again, but this time, the screen was joined with all kinds of flowery glitches. Restarted the device, and it went only downhill: now the Home launcher stayed all pitch black and nothing appeared. I waited a few minutes, but nothing there until the notification bar appeared. The home screen is apparently dead, and so are the menu keys. Switched to Nova Launcher(installed it just in case Home Launcher fails), and still dead. I couldn't access using any of the menu keys and had unusable launchers.

Hopefully I could still access to the settings from my status bar, but when I did, it started crashing immediately.

I've repeated the attempt a few times after restarting the device a few times, but nothing helped. It only got worse that the when the launcher did SEEM to work. It only showed the wallpaper without showing any of the icons/apps. And crashes again.

I could still access to the App menu via the settings, but couldn't open any of them and when I tried to uninstall them, the screen frozes immediately right after I gain access to the page (white page though) and gain this message: "Unfortunately Package Uninstaller Stopped!"

Then I convinced myself that the only thing I could do at the time was to factory reset the phone and then everything would go alright since I've just had to restore the system apps.

But then the black screen of death came right along with it:

"Secure booting error"

It seems that I'm out of luck... ... But just to check if I'm still left with resorts, I've downloaded the L7CWM file online...

... ...but it still didn't help.

So now I'm being left with no other choices other than asking for help. I never really understand what KDZ_FW_UPD.exe does since I had the LG Driver already before installing it, which I presume was for updating the phone to a newer or older version. And too complex tech articles are kind of alien for me.

EDIT(1 hour later): Okay, now I figured out the reason why L7CWM didn't work was because I didn't extract it to the right folder (after double checked via notepad that I was supposed to directly put it into the C:\ drive). Now it worked(?), but then it didn't.

After launching Flash_Bootloader.bat:

This message now appeared on the L7:

"Sorry!"

"SuperSU is not responding.

Would you like to close it?"

"Wait - Report - Close"

and a few minutes later

"Sorry!"

"Unfortunately, SuperSU has stopped."

"Report - OK"

Now I think the bugs till now happened was due to the fact that I've deleted a file that was required for me to launch apps... Now I just need the right fix.

After 5 minutes of screen inactivity the phone restarted by itself, kind of creepy... ...

Flash_Recovery.bat did nothing.

Reboot2Recovery.bat made it reboot but still struck on the same menu.

Nothing seems to be effective via the phone anymore, seems like I have to rely on abd but then again I don't know how... ... My dad is also f*cking pissed off ^ ^;...

__________________________________

I think that I explained the logs pretty precisely in case I missed something... I'll be very very very very very very thankful if someone could tell me what has caused my phone to fail though.

For references, here are the phone's specifications:

Model Number: LG-P705g

Android version: 4.0.3 (Stock)

Rooted:Yes (root checker)

Baseband version: MSM7227A-1-AA

Kernel version: 3.0.8-perf

Build number: IML74K

Software version: V10e-AUG-10-2012

If I don't get the phone fixed to being usable soon I think that I will get butchered real hard... ... Preferably needs a step-by-step guide made for toddlers... ...