[Upgrading, Modifying and Unlocking] dyuss_zero:
(possibly long post ;), I will try to make a post at least a little fun to read).

Guys, I humbly come before you, kneeling and desperate, trying to solve my problem :(.

I've serarched XDA and a lot (!!) of others forums and comunities to revive my P720H (LG optimus 3D Max in Brazil).

I am not a complete noob in custom firmwares for Android, but this time, the LG phone gave me a hell of a headache (and almost a divorce, for the 3 days going too late to bed, trying to solve it). :rolleyes:

I will explain what happened and what I've already tried to do and the results.

Causes:

I've tried to install ClockworkMod in my P720H because it still was in Android 2.3.6 (I think).

I've successfully rooted the phone using this thread: http://xdaforums.com/showthread.php?t=1886057 with the SuperSU app on GooglePlay.

When I asked CWM app to reboot in recovery mode (to wipe things and install the .zip file on the sdcard root) things got bad.

My phone could not get passed the LG logo anymore.

So far we have a cause: CWM app did something to the phone.

I am not able to boot the recovery menu nor to pass the LG logo on the screen

.

Over the communities we may find that it's a common issue.

It is important to say that

I am able to enter the 'S/W updating' state

. When I connect the phone to the computer, holding VOL+ and placing the battery, I got the S/W screen.

What can I do? In several posts (even here in xda) we may find 3 or 4 different solutions to restore the phone. I think I've already tried everything, but I am sure that the steps became fuzzy in my read and I mixed the solutions in the end.

Drivers:

- I have already the drivers installed: When I connect the phone (with or without battery and with or without vol+ pressed) my

Device Manager recognizes everything

. I don't have any component marked as 'unknown device' or with exclamations points or anything. This is a good thing, I guess. I had to install more than one thing to solve every driver problem. I don't remember exactly, but I think that the LGDriver-something and the omap4430 something too.

Solutions:

- I have tried the

LG Support Tool

and so far it appears to be the closest to a solution that I've reached. With the phone connected (in S/W mode or no), I insert the IMEI and the software recognizes the model and starts downloading something (500mb approx.). But after decompressing, during the installation phase,

it gets stuck at 4%

. I waited for more than 20min and still got nothing better than 4%. It appears to be a common issue too.

-

The LG_FlashTool

(version 1.2) does not work either. In fact, it does not even recognizes the phone. I've changed the COMport to 41 (according to some guide) on Windows Device Manager and chose the port 1 on LGFlashTool. Even after selecting the kdz, bin and fls files,

the software does not connect to the phone

. I don't have a screenshot here, but I've seen here in xda that the software displays the model of the phone on the top and a READY message on port 1. Mine does not do it.

-

KKDZ_FW_UPD_EN

: I've tried this one but it does not even start working. The interface is not that good, so I don't know where I may be failing. I need to 'read phone information' or not?

What do I have to chose on each combobox

? How to proceed?

And why the hell is there so much .exe on this thing? Do I have to run a apache server to do something?! :confused:

-

OMAP4BOOT

: This one connects to the phone and works, I think. But I don't know its purpose. It's just to place the phone on 'S/W updating' mode? If so, it's useless, because I can enter it easily. If no, maybe I am missing something. Either way, I don't have a version for the P720H. If I remeber correctly, it proposes P999, P760, P870, ... I choose P760 to test it and it works (apparently, again).

- SmartFlashTool: I don't remember if I have already tried this one. As I said, it was too much already.

- NVFlash: I've found it only to G2X, so I didn't know if I should try forcing it to my model. I can give it a try if you help me.

Other softwares and downloads:

KDZ:

- V10B_00 and V1A_00: found today and downloaded for my model and country (will try to extract things and use it later).

- LG_P725_V10F_00: I was using this one until yesterday, because I didn't have the one to P720H

- LGP700AT-01-V10d-232-03-SEP-11-2012+0.dz : Found in an indian repository of some kind of LG data leak. Apparently is useless. DZextract gave me nothing.

DLL: LGP720_20120330_LGFLASHv1377: Needed in some of the softwares above (LG FLashTool? I don't remeber).

BIN and FLS: LGP725_LG_P725_V10F_00_AP.bin and LGP725_LG_P725_V10F_00_CP.fls, extracted from LG_P725_V10F_00.kdz. I don't know, but I should try extracting these from the V10A_00, because apparently is the correct one for my model/country (I am not in my house right now).

Well... :crying:

tl;dr version:

I am facing a LG logo boot loop in P720H

. I've tried to reboot CWM in recovery mode but it didn't work. I've tried several approaches but I don't even know what is the point of each one. I found that this is the best topic to use, because is one of the fews that covers the P720H.

I have all those softwares and almost 5gb of downloaded material (kdz, img, bin, exe, ...) but I don't know what I am supposed to use.

In the end, I want my P720H in android 4.x if possible. If not, I just want the crap 2.3.6 again. :crying:

Can you help me? I am not a total noob in custom firmwares and roms, and I am willing to pass all the information that I can :fingers-crossed: