The lessons about this are learned daily. But here's a few answers.
1. How to do it. FOLLOW SONY'S INSTRUCTIONS!
2. Where to get it. SONY!
3. Why do this?
You tell us. The lesson about bios updates is to never do this if the bios is working.
i have sony vaio pcg- v505cp
i want to upgrade the bios please i need the file to upgrade it with and please tell me how to use it thank you