[Optimus L3, L5, L7 Q&A, Help & Troubleshooting] whatever9564:
SOLVED

Solution : Solution is as simple as downloading the LG's Mobile Support Tool / ( For other phone brands download the provided official support tool )

Within, there must be an option to reset the phone and flash the stock ROM ( the tool should download new firmware meaning its clean so the virus should be removed that way )

I did it in a different way as i was unaware of the solution at first, you can read the whole progress of elimination below if the 1'st solution didn't work for you

Solution #2 : ( Starts from edit#5) Basically try to flash any package ( or the specific package i used ) with the tool i used untill it will make your device go into emergency mode, followed by a prompt "Connection to server failed, try again in a moment". If you don't get that error, then the flashtool will probably just flash the firmware and the virus will be probably gone anyway.

If you do get the error, simply Download the LG Mobile Support Tool, which will then detect your device in emergency mode and download and flash latest firmware.

PS : if something fails in the last step, try going to Device Manager on your pc, and disable LG Modem driver ( Under Modems )

Big Thanks to EVERYBODY from ONEPLUS FORUM who participated in helping me to get rid of this virus ( thread can be found under exact same name as this one )

OLD Elimination Progress Post :

Device : LG-P700 (L7)

By hardcore i mean that it survives hard factory reset, system resets, doesn't allow to boot into bootloader/fastboot/stock recovery via adb manually or by physical buttons ( device simply reboots ).

I haven't found any good way to unlock bootloader for this device, other then using the Clockwork MOD present in the xda developers thread for a guide on this device, which doesn't seem to do anything other then simply rebooting the device, it says "unallowed user" during process.

The device seems to be infected hard and the "virus" starts to download graphical apps and pop random ads when the device is connected to internet with a big grey image that says "Hello World".

Edit : I've pushed and installed malwarebytes into the system ( via adb, without internet connection ) so it could scan for viruses. It found 6 threats which cannot be uninstalled.

Description :

Andrdoid/PUP.Adware.Airpush

Android/PUP.Exploit.Lotoor.bg

Android/PUP.Riskware.Agent.glvp

Andrdoid/PUP.Lotoor

Android/Trojan.Elfan.a

Android/PUP.Lotoor.un

When uninstalling these with malwarebytes, the names of the aplications are as follow ( not correspondent to the previous list's order ) : System Update; PacProcessor; WifiPatches; com.android.set.confim; Contacts; Network

Those are names of the threats, the apk's and their location are listed below but are not relevant

I will now try to maybe uninstall them somehow via adb...

Edit2 : When i try to uninstall any of them via adb it just prompts "Failure"

Edit3 : Tried to root the device with framaroot, without internet connection, Aragorn's exploit doesn't work, prompts "Error#7". Gandalf's exploit works, but "installation of Superuser and su binary have failed"

Edit4: Entered recovery mode ( i don't know if that is relevant ) via physical buttons, i get this image : ( unfortunately i can't post outside links yet, so i will quote the message ) "Press and hold the POWER key more then 8 seconds to reboot and continue using phone" ( rest of the message is irrelevant )

Nothing else happens, device doesn't react to touch, only way to continue is to reboot as prompted

Edit5 : I tried to flash the latest available firmware ( V20H (AORFBK) ) using LG's flash tool 2014 ( you can find it if you google it, its the xda thread, you can download it from there, sorry i can't post links. Use the normal flash, choose your country and then click start )

It extracted the package, and then prompted me : "Connection to server failed, try again in a moment", then booted the device into emergency mode, device does not respond to touch or any other physical button

If i remove the battery and put it back on again, device does not longer boot to system, instead it boots to this emergency mode