[LG Optimus L9 P760, P765, P768, P769] damathos:
Sorry for not answering earlier... I was in a training course for my job in Chicago, just came back yesterday.

So long story short (kinda)... after a successful unlock (yay !), and an unsuccessful install of a 4.4 base rom (my bad...), I bricked my phone (soft brick I guess).

Phone would boot only on the dead Android logo... S/W mode and Fastboot mode were the only thing I can use.

Tried different method (spent 4 days !, reading tons of topics, trying so many solutions to the point where my pc Desktop was covered with shortcuts/tutorials/etc.), but to no avail.

I tried what you told me Kuma, but nothing really worked. So...

... I decided that I had enough of Android phones :(.

I mean, I like the concept, the tweakability, the (supposedly) "open" spirit, the numerous apps, the devs here at XDA working like beasts to help us (thanks guys ! :highfive:).

I use to be a Windows Phone guy (from 6.5 to Mango) and liked it (yeah yeah, I know... Windows is evil, blah blah blah :D ), and then, when Android came out as a big thing, I tried the switch... first by dual booting some custom roms (using Haret+Nand) on my HTC H2 (Leo). I was curious and also impressed by the devs work on these roms.

So after that, my phones were Android's (ICS then JB).

First: while I appreciate - again - the tweakability/flexibility (!) of the OS, I was also tired of the lack of smoothness/snappiness on most of the phones I had. Most of them had at least dual core processors and plenty of ram ! how come the OS still has some lags/unresponsiveness ? well... I know it's partly due to the Android system/idea. Some phone have a really well implemented/optimized rom, some don't (thanks LG).

Second: how in the name of fu** is it possible to decide to lock/encrypt/etc. a bootloader on an Android phone (isn't that system suppose to be open ?) and give a gigantic PITA to the users who want to try other roms ? (hey LG, they won't do it if the stock rom wasn't full of bloatware and optimized for the phone... they won't be angry at you and switch to other brand/OS !). And WHY other phones from the same brand have easy unlocking method ?

I spent so much time trying to tweak my phones, make them more responsive, unlock them, so I can ENJOY using them... sadly, without a lot of success (except from my good ol' HD2 - man, what a great phone it was !).

I give up (for now) on Android... I don't like the way it's going now.

Since a week, I'm back to Windows Phone, and Nokia. Just got a Lumia. Man, how snappy/smooth it is (I cant believe it is that smooth considering the "only" 2 cores 1GHZ Snapdragon). I just love it, really.

Of course WP8 app store is far away from Google's... but, to tell the truth, I don't care as I wasn't a million-apps user on Android. What is available is way enough for me.

Of course WP8 is pretty locked on a lot of aspects (no access - directly - to system files, need signed apps and such), but again I don't mind. It is so smooth that I don't feel the need to tweak (what a gain of time ! I spend more time USING the phone than tweaking it :p )

Of course WP8 needs improvement (native move-to-SD, native storage management without using third party apps, etc), but hey ! 8.1 Cyan update is on its way with these last features I need.

Of course "Microsoft is evil"... but I don't think Google (or Apple) is going in the right direction too.

And... this is the cherry on top, there is a WP8 XDA Community :victory:

So, Android and L9 users/devs... goodbye ! thanks to all for sharing your knowledge, for your work, for trying SOOOOOOO hard to unlock this **$%#@* bootloader. I hope something will come up soon so you can finally do it the easy way.