Steps on how to flash LG Stylo 5 with A Flash Tool:
Step 1: You will have to download the stock rom of the device you want to flash.
Step 2: These files are normally in kdz format.
Step 3: Now you need to download and install LG drivers here.
Step 4: Now you need to download and also extract the LG flash tools here.
Step 5: Now after extracting the flash file (Stock Rom) of the device you want to flash, copy the KDZ file from the (ROM) folder and paste into the flash tool folder.
Step 6: Please before doing this, also make sure you have at least 50% or more battery life on the device before trying to flash it.
Step 7: Now you need to boot the device into recovery mode (download mode), you can do this by press and holding the volume up or down button and connecting the USB cable to the phone, make sure the USB is connected to the PC first.
Step 8: Now you need to launch LGFlashTool2014 (or any of the version you downloaded), but you need to run it as an administrator. And note that if it does not start it means you don’t have Visual C++ installed, you need to download and install it.
Step 9: After the flash tool has opened, click on “Select Type” and select “CDMA”.
Step 10: Click on “Phone Mode” and select “DIAG”
Step 11: Now you will see “Select KDZ file”, this is where you need to locate the flash file (Stock ROM) of the device you downloaded.
Step 12: Now a quick note for you, if you want to flash the device without losing any files, click on “Normal Flash” you will see it at the bottom. But if you want a full device flash, click on “CSE Flash”. But please only use this only if you want to upgrade or unbricking the device.
Step 13: Now click on “Start” and a dialog box will show up for you to select a language, do that and click on “OK” and wait for it to complete the process. Always remember after flashing, first booting will always take time, thanks for reading.