It is generally not possible to change the operating system (OS) on an Android phone, as the OS is permanently installed on the device's firmware. However, you may be able to install a custom ROM on your Android phone, which is a version of the Android OS that has been modified by third-party developers. Installing a custom ROM can give you access to new features and updates that are not available on the stock version of the Android OS, but it can also introduce potential stability and security issues.
To install a custom ROM on an Android phone, you will need to:
Root your phone: Rooting is the process of allowing users of smartphones, tablets and other devices running the Android mobile operating system to attain privileged control (known as root access) over various Android subsystems. Rooting your phone will allow you to modify system files and install custom ROMs, but it will also void your warranty and may introduce security risks.
Install a custom recovery: A custom recovery is a modified version of the Android recovery mode that allows you to install custom ROMs and other modifications to your phone. There are several custom recovery options available, such as TWRP (Team Win Recovery Project) and ClockworkMod Recovery.
Download and install a custom ROM: Once you have rooted your phone and installed a custom recovery, you can download a custom ROM from a third-party website and use the custom recovery to install it on your phone. It's important to research and choose a reputable custom ROM that is compatible with your device, as installing an incompatible or unstable ROM can cause problems with your phone.
Installing a custom ROM on an Android phone can be a complex process and is not recommended for users who are not comfortable with advanced technical tasks. It is also important to note that rooting your phone and installing a custom ROM can introduce security risks and may void your warranty.