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PREREQUISITES:

Download Necessary Files:

• Download Your Files and Tools to Flash Your Firmware on Your OnePlus 6 (The right firmware package for the OnePlus 6).
• Another thing you would need MsmDownloadTool (comes with the firmware files usually). It is an important tool used for flashing the firmware on your device.
• On your Windows PC, ensure that you have the OnePlus USB drivers installed so that the flashing process goes smoothly. These few drivers will aid in creating a reliable connection between your computer and the OnePlus 6 for flashing purposes.

Enable USB Debugging:
Once that is done you would need to enable USB Debugging on your OnePlus 6 for it to get connected to your computer. Follow these steps:
Select Settings >> About phone from the settings on your OnePlus 6.
Find the Build number and tap it seven times to enable Developer Options.
Return to Settings and tap on Developer Options.
Scroll down and click USB Debugging to enable it.

This is an important step as it enables your computer to communicate effectively with your device while flashing it.

Extract Firmware Package:

• Once the firmware package has downloaded extract the compressed firmware file on your PC. Unzip the package to a convenient place because you will need to browse for these files using the MsmDownloadTool.
• Make sure you don’t forget where the folder is located as you will need to load the firmware from this directory using the flashing tool.

The following are the steps to boot OnePlus 6 into EDL (Emergency Download) Mode:
Completely turn off your OnePlus 6.
Now connect your OnePlus 6 to your PC via USB Data cable.
While holding down the Volume Up and Volume Down buttons.
Keep holding both volume buttons and press the Power button at the same time.
Continue to press and hold all three buttons until your OnePlus 6 is booted into EDL (Emergency Download) Mode.
If your device will not enter EDL mode in one go, you must try again. Make sure that your USB is also connected properly.

Open MsmDownloadTool:

• With your OnePlus 6 now in EDL mode, go ahead and run the MsmDownloadTool on your PC:
• Go to the folder where you extracted the firmware package.
• Now find the MsmDownloadTool EXE.
• How to launch the tool: Right-click the file and choose Run as Administrator.
• This will ensure that the tool has the required access to flash the firmware onto your device successfully.

Load Firmware:

• This is how you load the firmware after you open MsmDownloadTool:
• Find the Target button in the tool’s interface and click.
• Go to the folder where you unpacked the firmware files.
• Choose the suitable firmware file or firmware folder.
• The tool will now read the firmware and prepare for the flash.

How to Connect the OnePlus 6 to Your Computer:

• Keep your OnePlus 6 in EDL and connected to your computer. MsmDownloadTool should identify your device automatically. If the tool is unable to identify your device, follow the below steps to troubleshoot:
• Make sure you have the correct OnePlus USB drivers installed.
• If you continue to have problems, try a different USB cable, or a different port on your PC.
• Reboot both your OnePlus 6 and your computer, then try again.

Start the Flashing Process:

• Once the firmware has loaded appropriately and your OnePlus 6 is recognized:
• Click the MsmDownloadTool Start button.
• You will now see the tool beginning to install the firmware to your OnePlus 6
• While doing so, do not unplug your device or cancel the flashing process.

The flashing process might take a couple of minutes, so be patient and let the device work without disturbance.

Let the Process Work:

• Be patient as the firmware-installed has happened and keep your PC connected with OnePlus 6.
• Never unplug your OnePlus 6 from the PC until the tool you used shows the flashing process has succeeded.
• Revise this process from the start if your PC (or other device) encounters interruptions (such as power failure).

Complete Setup:

• Once the flashing process is complete, your OnePlus 6 might automatically reboot.
• If it doesn’t automatically restart, turn your device back on with the Power button for a few seconds.
• The first boot after flashing might take a bit longer than normal since the system is optimizing files and configuring for final settings.
• After your OnePlus 6 boots up completely, follow the initial setup and set up the device according to your needs.

Important Notes:

1. Consolidate Your Data: Since flashing firmware will wipe everything on your device. Always back up data before taking your step.
2. Use the Right Firmware: Incorrect firmware can also lead to the system becoming unstable or the device being rendered unusable.
3. Charging your phone: Ensure that you have a minimum of 50% battery on your OnePlus 6 to avoid an unexpected shutdown while flashing.
4. Know the Risks: A botched firmware flash can brick your device and void your warranty.
5. Therefore, do not miss the official forums for OnePlus, and do not fail to check the documentation that the company is currently making available.

Final Considerations:

These instructions are a general guide on how to flash firmware on the OnePlus 6. Depending on your firmware version and OnePlus updates, the exact steps may differ slightly. Always confirm with the official OnePlus documentation for the most accurate steps.

With these steps, you should be able to flash your OnePlus 6 firmware and with that get things working back to how they are supposed to be. In case of any issues, get help from OnePlus Support or experienced community members.