Your console must be running Firmware 9.00 or have a compatible backport applied if running lower firmware.
This portion usually identifies the release group or the format type. In the context of PlayStation 4 (PS4) archiving, specific tags identify whether the file is a dumped PKG (package file), a modification, or a scene release. "SPSX" often relates to the preservation of PS4 packages, indicating that this file is likely a dump of an official digital package intended for archival purposes. -SPSX--ERSOTE-CUSA28863-USA-Update-1.19--9.00-1...
If you’re working on or modding your own console for homebrew (where you own the game and dump it yourself), I can help with: Your console must be running Firmware 9
Here is the breakdown: