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Before You Begin:

It is important to have a backup for any crucial files because this process can result in loss of data. Keep in mind that flashing firmware can delete all files, so make sure you store your data safely elsewhere. Flashing is irreversible, you can lose data, so confirm that the backups are done properly before proceeding.

Guide to Installing Firmware:

• Download the right firmware file for your OnePlus 5 from a trusted site. Make sure it matches your device’s model number exactly to prevent potential compatibility issues. In case you use the wrong firmware device won’t function as expected.
• Verify Battery Level: Ensure that your device is adequately charged to sustain power during the flashing procedure. You should at least have 50% battery, because any interruptions could lead to issues with this procedure. It may freeze if the device shuts down unexpectedly.
• Look for All required Drivers: Ensure you have the OnePlus USB drivers installed on the PC so that your device connects correctly with your computer.

Flashing Firmware Process:

• Unpack the firmware package
• First, download and extract the firmware package to a directory on your computer.
• Make sure you have all files, including but not limited to MsmDownloadTool and drivers.

Run OnePlus 5 EDL Mode:

• Shut down your OnePlus 5 completely.
• Use a good quality USB cable to connect your device to the computer to prevent disconnection issues.
• Press and hold the Volume Up and Volume Down buttons at the same time, and then press the Power button.
• Keep all three buttons pressed down until it goes to Emergency Download (EDL) mode.
  If EDL still doesn’t work restart the process or try other key combinations.

Open MsmDownloadTool:

• Find the folder where the firmware files you extracted are saved on your PC.
• Execute the MsmDownloadTool. Exe file as an administrator.
• Check if you have the necessary permissions as the code itself may raise permission errors.

Load Firmware:

• MsmDownloadTool target button clicks on it.
• Choose the firmware file (or the directory containing the extracted firmware files)
• To avoid loading mismatched firmware, verify that the appropriate firmware has been loaded.

Connect the Device:

• Make sure your OnePlus 5 is still in EDL mode and connected to the computer using USB.
• The tool should automatically recognize your device. If it doesn’t, reconnect the USB cable or change the USB ports.
  In case your device does not get detected, re-install the Qualcomm USB drivers.

Start Flashing:

• Start flashing by clicking on Start in MsmDownloadTool;
• The tool now starts flashing the firmware on your OnePlus 5.
• Do not use the computer or disconnect the cable while this takes place to avoid failures.

Wait Until the Process is Done

• It can take several minutes for the flashing process to complete. Do not disconnect or power off your device while the process is ongoing, so please be patient.
• This will show a progress bar indicating the installation steps.
• If it does get stuck, restart your computer and phone, and then try again.

Complete Setup

• During the flashing process, your device may reboot.
• If it doesn’t, then you can reboot your OnePlus 5 manually via a long press on the Power key.
• If required, configure your device as a new device or restore your backup.

After this process, make sure to set up all required configurations like the network and display.

Important Notes:

1. These instructions are general and guide on how to flash one plus devices. The steps may differ slightly depending on your device model, and the exact firmware version.
2. Follow these instructions at your own risk! Do so at your own risk and always consult the official OnePlus documentation.
3. So, be sure you download the firmware and tools from legitimate sources to ensure no corrupted files or threats.
4. In case your device does not boot after flashing, please boot in the recovery mode and perform a factory reset.
5. This means if you as a layman flash the wrong firmware, it can lead to bricked devices. Make sure you know the risks first.
6. Check OnePlus forums or official customer service channels for more troubleshooting tips.

If done correctly, these steps can help you receive working firmware on your OnePlus 5. Be patient as well as cautious to make sure that you complete all of the steps involved in this process without any hiccups.