Alongside the PS5 Firmware 5.00 Update, today Sony also pushed live a PS4 System Software / Firmware v9.50 Update which was available to Beta PS4 Testers last month following the previous PS4 OFW revision with the official changelog outlined below. 
As always, DON'T UPDATE if you wish to use PS4 Game Backup PKGs via PS4 Torrents and Homebrew Apps whenever a new PS4 Jailbreak Exploit arrives... with some related Tweets from PlayStation 4 Scene developers below.
Download: PS4 Firmware 9.50 Update (US) / PS4 Firmware 9.50 Update (EU) / PS4 Firmware 9.50 Update (UK) / PS4 Firmware 9.50 Update (AU/NZ) / PS4 Firmware 9.50 Update (JP)
Below is the official 9.50 PS4 Firmware Changelog from Sony's page: PlayStation 4 system software update - PS4 9.50 system software features
Version 9.50
Main features in the system software update
In (Party), we've updated the following:
Fixed on PS4 FW 9.50 and PS5 FW 5.00
As always, DON'T UPDATE if you wish to use PS4 Game Backup PKGs via PS4 Torrents and Homebrew Apps whenever a new PS4 Jailbreak Exploit arrives... with some related Tweets from PlayStation 4 Scene developers below.Download: PS4 Firmware 9.50 Update (US) / PS4 Firmware 9.50 Update (EU) / PS4 Firmware 9.50 Update (UK) / PS4 Firmware 9.50 Update (AU/NZ) / PS4 Firmware 9.50 Update (JP)
Below is the official 9.50 PS4 Firmware Changelog from Sony's page: PlayStation 4 system software update - PS4 9.50 system software features
Version 9.50
Main features in the system software update
In (Party), we've updated the following:
- Now when you start a party, you can select either an open party or a closed party.
- An open party lets your friends join without an invite. Friends of party members can also join.
- A closed party is only for players you invite.
- You can now individually adjust the voice chat volume of each player in a party.
- We've added Ukrainian language support.
Fixed on PS4 FW 9.50 and PS5 FW 5.00
