It is easy to upgrade. You can go to customer service to upgrade, or download PC suite from Nokia official website to upgrade yourself. 4. 13 There is no sonic boom. It is best to download MP3 songs with bit rate above 128. After all, it is a music mobile phone. As for cracking, what are you doing? How many softwares can you install? You can download the latest version of commonly used software from the official. They are all signed, so you really need to install unsigned software. You can use UC browser to visit Skynet to sign. Soon, you can also install the software "free signature" on your mobile phone and then sign it yourself.