Here’s the official Tutorial from the Sony Network Website:
USB STICK NEEDS TO BE FAT32
PlayStation®3 System Software Update
Update using a PC
ALWAYS ACTUAL OFFICIAL FIRMWARE: http://us.playstation.com/support/systemupdates/ps3/index.htm
Required items
- PlayStation®3 system
- A wireless controller
- A USB cable
- A PC with Internet access
- Storage media (Memory Stick™, SD Memory Card, CompactFlash®)* or a USB Mass Storage device such as a USB flash drive
(At least 168 MB of free space required)
* An appropriate USB adaptor (not included) is required to use storage media with some models.
Update data download procedure
- Create a folder on the storage media in which to save the update data. Using a PC, create a folder named “PS3” on the storage media or USB device. Within the PS3 folder, create a folder named „UPDATE“.