The company also posted detailed instructions for users to install the update even if their consoles won’t turn on.
Required equipment includes a USB Mass Storage device such as a USB flash drive with at least 168MB of free space, or older models can use an SD card, Memory Stick or Compact Flash card.
First off, download the firmware update to your Desktop or any place else that is easily accessible and make sure the full image downloads.
Load up music, movies, and photos There are a few ways to get music, video, and photos from your computer to your PS3: wirelessly stream it; burn a CD with the data; or use a USB thumbdrive.
Streaming is a great option if you want constant access to your PC's media library, but often the experience is tainted by lag and a spotty Wi-Fi connection.
Therefore, you have to restart from the beginning in case download fails in between.
Secondly, since update cannot run in the background(not even the download) your Play Station can’t be used during this time.