Disclaimer: This article does not provide direct download links. This guide explains the process used by archival communities. Modifying your PS4 violates Sony's Terms of Service and can result in a console ban.
If you are determined to pursue this, here is the workflow to install a GH2 PKG on a Jailbroken PS4 (FW 9.00) :
Prerequisites:
The Hunt for the File: Visit the "r/ps4homebrew" subreddit or "PSX-Place" forums. Search for "Guitar Hero 2 PS2toPS4" or "Arcade Game Series GH2" (some groups rename the file to avoid DMCA). Look for the "hot" tag – usually files uploaded in the last 30 days.
Installation Steps:
Running the Game:
Launch the bubble. You will see the PS2 startup screen, then the glorious main menu of Guitar Hero 2. If you experience audio desync, adjust the "Audio Offset" in the GH2 settings to +50ms.
A PKG file is essentially an archive containing the game assets, the emulator binary, and metadata (trophy data, save file structures). In the case of a Guitar Hero II PS4 PKG, the file would contain: guitar hero 2 ps4 pkg hot
A functional PKG for Guitar Hero II on PS4 must map PS2 pressure-sensitive inputs to the DualShock 4 or DualSense controller.