You will need
  • USB cable;
  • - computer with Internet access;
  • - software for flashing phone;
  • - the new firmware.
Save all user data on the external memory card. Make a backup of your address book, installed applications, and photos. If necessary, save the Internet cache. With 90% probability all of these materials will be erased when flashing. If possible, use so-called "cloud" services like Dropbox, Google Docs or Sky Drive for additional backup. Rarely, but there are times when external memory card is inaccessible after you install the new firmware.
Go to the Internet with the phone, which is going to reflash, and find information about the software version. Perform a hard inquiry updates. It is possible that a new firmware version from the manufacturer already exists, and the apparatus will suggest to download it and install. Note the method of connecting the mobile phone to the Internet. The amount of data to download may be too large for a GPRS connection, not to mention the price paid per megabyte. Also worth bearing in mind that a failed upgrade attempt could theoretically transform the device into a "brick". After this sad event of the campaign in service center not to avoid.
In case if the mobile phone was unable to detect updates for your software, go to the website of the device manufacturer to find the firmware there. Download it on your computer and run the program that usually comes with cell phone and provides full collaboration of the device and the computer. If the program is not in the box with the phone, it can be easily downloaded from the website of the manufacturer of your mobile phone.
Connect the phone to the computer and run the program. Following the instructions on the screen, initiate the process of installing the new firmware and wait for it to end. It is important to be neat and to prevent powering off the device and keep the USB cord is accidentally withdrawn from the port of the phone. Otherwise you will have to repeat the whole upgrade process again.
If you are an advanced user, then try to install custom firmware. This firmware is developed by third party programmers, fans of certain phone brands or models. As a rule, the installation of such software requires some knowledge of cell phonenecessary utilities for installation, as well as confidence in their abilities. Custom firmware usually have a lot of advantages in comparison with the official, however, be aware that the installation of such software the user does so at your own risk. In the case of unsuccessful completion of the process may be refused warranty service based on the availability and use of unofficial firmware.