PlayStation 4: A look at the additional games the FW 7.50-7.55 jailbreak lets you play - Titles include TLOU Part 2, Crash Bandicoot 4, Cyberpunk 2077 Watchdog: Legion, FIFA 21, Ghostrunner, Cuphead and more! - Wololo.net
CGFw: Check Game Firmware App for Required PS4 Version by OfficialAhmed | PSXHAX - PSXHACKS
PSXLink App: Download PS4 Game Update PKGs & Firmware by Rasoulia | PSXHAX - PSXHACKS
How to Upgrade PS4 Games to PS5 | Push Square
PSXLink App: Download PS4 Game Update PKGs & Firmware by Rasoulia | PSXHAX - PSXHACKS
PlayStation 4 Remote Play Comes to Android Devices With Firmware 7.00
Regarding the misinformation about PS4 games on PS5, yes even PS5 requires certain firmware to run PS4 games with backwards compatibility! Prof in the video. : r/ps5homebrew
PS4 Pro games list, specs comparison and everything else we know about Sony's new hardware | Eurogamer.net