(Last Updated On: October 19, 2019)

Flash Stock Rom on LG Optimus F7 US78011A

This is the time to Install greatest and latest Android version to LG Optimus F7 US78011A phone.and we give you all needed files to Flash your phone and we discuss about errors of flashing Rom and we offer you solutions for errors. we use LG Flash Tool but we also give you all Flashing methods and all required files, all available Stock firmwares to your LG Optimus F7 US78011A. If you want to install Rom then you are in right place so Flash. 

What is Stock ROM?

Stock ROM– Stock ROM is Original ROM/ Official Rom that your phone have. IF you buy a android phone. It have a Stock ROM. Stock ROM is default ROM.

Warranty – Stock ROM does not avoid your warranty. One of the reasons that android people don’t go for Custom ROMs is warranty. If you install custom ROM then your warranty is canceled on time.

Premium Apps – Premium apps is which you did not install apps.  Normally stock ROMs come with unique premium apps to attract customers. These premium apps differ from one mobile vendor to another vendor. These apps can be anything like music players, apps stores, widgets, Track-ID (Sony) , S voice (Samsung)

Security– in stock ROM, You can be sure that it does not contain/include any spywares, malwares, backdoor,trojan or other malicious tools but Custom Rom

Before Flash Stock Rom on LG Optimus F7 US78011A, you should know these things

You can do this if you want to Go back to Custom Rom to Official Stock Rom.
phone’s pc software does not want to install but phone driver must works on your PC without error.
This Stock Rom has to be installed on this model only.
Deactivate your security protection for moment.
 Your phone should have 50% + battery power. If not, you should charge the phone before doing anything else.

Why I want to Install Stock Rom

When phone does not on.
Install Lollipop on LG phone

Install Marshmallow LG phone
When phone does not pass “LOGO” Screen / boot image
When phone get “could not do normal boot Odin mode” error
When phone get “System errors”
If you think though your phone go crazy / Slow even after performing reset, then you can flash         Stock Rom
When phone broke after rooting.

Flash Stock Rom on LG Optimus F7 US78011A

Requirement for Flashing Official Firmware/ ROM

 LG Optimus F7 US78011A USB drivers.
 Enable developer mood and USB Debugging
LG Flash Tool Download, or  Download From XD Link

LG Optimus F7 US78011A Stock Rom – Link is below
you had better install .NET FRAMEWORK.

Root LG phone properly and safty

Installation Guide for flash Stock Rom on LG Optimus F7 US78011A phone

Step 1,

First of all, get backup (easy and ultimate backup) your apps, contacts, messages, photos, videos,Music, Call Logs,Whatapp Viber Messages and any other important data stored on the internal storage and external Storage (SD Card)  before Flashing.

Step 2,

Download and install LG USB drivers then, Download LG Flash tool

Step 3,

Take your LG Optimus F7 US78011A and boot into download mode. To do- See below, If it fails for first time repeat it

Install Stock Rom on LG

  1. Power button
  2. Select Turn off the phone.
  3. press the volume up button on your LG
  4. During you are holding the volume up key, plug in your phone’s USB Data cable.
  5. Keep pressing the Volume up Key until the download mode appear.

Step 4

Now Click Downloaded “LG Flash tool 2014″ to extract (Extract here) , You will want this software.

Step 5

Download LG Optimus F7 US78011A Stock Rom. 

Download Stock Rom – Click here

use above link, if not works then try Alternatives – Download LG Firmware from Click here or Click here. in order to download Stock rom, IMEI number is required for you. Get your IMEI from the Box which phone came or dial *#06# after dialing that will show your IMEI code . Once you have found your IMEI Code, paste it in the textbox and Click the ” Check” and download the your phone’s Stock Rom.

after that, Copy the KDZ File (Stock Rom) to “LG flash tool 2014 Folder

Install Stock Rom on LG

Step 6,

Double Click to Run “LG flash tool 2014” There is a screenshot of LG Flash tool


  • Select Type – 3GQCPT or CDMA you don’t want to get worry about selecting this option or that as Flashtool is modified only for devices with SIM.
  • PhoneMode = DIAG
  • Reset time = 33000
  • Browse KDZ file (Rom) and Select it. (Locate to “LG flash tool 2014 Folder” There is the copied one)

Step 7,

Now you can see there are two options on the LG Flash tool Window. I Know you that you are in curiosity to know what they are. actually there is not big deal as we think.


Normal Flash – “Normal Flash” If you want to install Stock Rom then you should select “Normal flash” another thing I want say, in this, you will not lost any data from applications and Internal memory and Memory chip.

CSE Flash – If you want to flash Custom Rom (Custom Rom is not official one. more details about custom Rom.) then, select “CSE Flash” as wel as in this, you will lose all your data from applications and Internal memory. CSE make a clean installation. you can flash Stock Rom with CSE too.

Step 8,

Click the “start” button after selecting above one of option. 


Step 9,

Select your Region and Language and Click OK. please Disconnect Internet before you choose OK and also make sure to turn off your Antivirus for little moment


Step 10,

it will start installing your new firmware like this 🙂 


First boot may take some time so please wait.after completed please perform Factory reset If not, phone will be slow. you can enjoy your official firmware.

Errors Related to Flashing Stock Rom on LG

Stuck on LG Optimus F7 US78011A logo

“I can go to S/w Upgrade mode but i  can’t go to Recovery mood”. If you face this kind of problem then install Stock Rom again. If you have any other problem please comment.

unresponsive to touch or power button controls

I flashed New KDZ firmware, and now my screen would become consistently unresponsive to touch or power button controls. I do Factory reset also, but problem persist. If you face this kind of problem, Try to Factory reset. If not works, then Try to CSE flash.Not the normal Flash. If not works download another Stock Rom because that Rom may be damaged.

Connection to server failed. Try again in a moment

I’m tring to flash a Rom. Now it says ” Connection to server failed. Try again in a moment” And my phone stucked in Download mode. If you face this kind of problem, Don’t press Ok and please wait because still copying in the background window and on phone screen as wel. however if not works then, Press power button and hold it till u get lg logo. any other problem? please comment

Problem with communication between cell phone and Pc


Try another USB port.
Try another USB cable.
Try another Mobile USB driver

lg flash tool required info cannot be found

Try to CSE flash. If not works, The Rom which you choose is not match with your phone try to find another one.

lg flash tool upgrade stopped due to an error

Try to CSE flash.
Try another USB port.
Try another USB cable.
Try another Mobile USB driver
Download all required files again.

lg flash tool 2014 has stopped working

  • Download the wx.rar  file
  • extract it using above extracting software.
  • Go to  C:ProgramDataLGMOBILEAXPhone
  • Now Paste  wx.dll file in the phone folder
  • Now try install again.

How to install Marshmallow on LG Optimus F7 US78011A

we know,some phones Versions still not received android new Software updates, It depend on country too. imagine  that you are in Sri Lanka and you phone have Lollipop. But you can only find Korean Rom with Marshmallow. then you can also Flash it as a Stock ROM and use English language without error (you can update to marshmallow)

How to install Lollipop on LG Optimus F7 US78011A

some phones Versions still not received updated android, It depend on country too. imagine  that you are in Sri Lanka and you phone have Lollipop. But you can only find Korean Rom with Lollipop. then you can also Flash it as a Stock ROM and use English language without error 

How to revert back to the previous version of Android

When you Flash new Custom Rom, If it is still testing one then you will definitely get errors.. Like Camera fail, WIFI fail, NFC,GPS fails..  So, in this situation, You have to get previous version of android OS. But is there any chance to downgrade Android lollipop to kitkat or Marshmallow to Lollipop? I would Like to say. YES YOU CAN.. you can use this post to go Back to kikat or Lollipop. go above one of Link and find previous version.

My phone stuck on boot logo/keep restarting

That means your current Rom is Corrupted or damaged. Now you have to Install Stock Rom to ON your phone. use this post to Flash new Stock Rom. If you can, use different Rom

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