How to install a fresh version of Android on your phone

To install a fresh version of Android on your phone, you will need to follow these steps:

First, make sure that your phone is compatible with the version of Android you want to install. Some older phones may not be able to run the latest version of Android.
Back up all of your important data. Installing a fresh version of Android will erase all of the data on your phone, so it’s important to make sure you have a copy of anything you want to keep. You can use your phone’s built-in backup feature or a third-party app to create a backup.
Download the Android firmware file for your phone. You can usually find this on the manufacturer’s website or through a search online.
Connect your phone to your computer using a USB cable.
Download and install the Android SDK (Software Development Kit) on your computer. This will allow you to communicate with your phone using ADB (Android Debug Bridge) commands.
Open a command prompt or terminal window and navigate to the directory where you installed the Android SDK.
Enter the following command to reboot your phone into fastboot mode: adb reboot bootloader
Once your phone is in fastboot mode, enter the following command to flash the Android firmware file: fastboot flashall -w
Wait for the process to complete, then reboot your phone.
Set up your phone as you would a new device, restoring any backed-up data as needed.