Where to download safely: The official Sony servers still host this file. Search for "PlayStation 3 System Software Update 4.90 Official Sony" or use the direct URL from Sony’s support site.
If your console isn't connected to Wi-Fi, you can download the PS3UPDAT.PUP file from the official PlayStation site. Save it on a FAT32-formatted USB drive in a folder path named PS3 > UPDATE . How to update PS3 console system software - PlayStation ps3 system software update 490 upd download 2021