If you rarely turn on your PS3, the update may appear mandatory for signing into PSN or playing newer game discs.

Sony has released , even years after the PlayStation 3 was officially discontinued. This is a mandatory stability update.

Yes. However, if you use custom firmware (CFW), do not install this until your CFW developer releases an update.

Here’s a short, clear piece you can use for a blog post, status update, or news brief about . Title: PS3 Firmware Update 4.90 – What You Need to Know