Firstly, download the PS3 firmware update on to a PC. Inside this folder, create another folder called “UPDATE”. When the firmware download is complete, it should be named “PS3UPDAT. Many Play Station 3 (PS3) gamers may not be able to connect their Play Station 3 to the Internet, but this doesn't mean that they cannot get their PS3 updated to the latest firmware.
Confirm that the storage media is connected to Play Station 3 system, and retry the update process as instructed above.
Check that the USB device is formatted to the File Format FAT 32 or FAT 16.
An update to the PS3™ system software was released on November 1, 2016.
You can use this update to upgrade your system software to version 4.81.
The Play Station 3 will not recognize NFST File Format.