Steps to Flash an Android Phone (via PC):

Prepare Files: Download the exact firmware (Stock ROM) for your specific phone model, the flashing tool (e.g., SP Flash Tool, Odin, Fastboot), and USB drivers.
Install Drivers: Install the VCOM or manufacturer-specific USB drivers on your computer to ensure the device is detected.
Launch Tool & Load Firmware: Open the flashing tool (e.g., SP Flash Tool) and select the scatter file (usually a text file) included in the extracted firmware folder.
Connect Phone: Power off the phone and connect it to the computer via USB cable, often requiring the battery to be removed and re-inserted (for MTK devices).
Start Flashing: Click the "Download" or "Flash" button in the tool. A progress bar will indicate the installation process.
Complete Process: Once the flash is complete, a "Download OK" or green tick will appear. Safely disconnect the phone and power it on (first boot may take longer).

Key Considerations:http://

Safety: Ensure the battery is charged (at least 60%) to avoid the phone turning off during the process, which can brick it.
Method: For Pixel phones, the Android Flash Tool website can be used in a web browser.
Other Methods: For locked phones, you may use recovery mode to wipe data, or specialized software like Fixppo to flash without expert knowledge.