Update: The Official PSGroove Payload for Retail PKG Installs update is now available, with details on it posted HERE for those interested and evilsperm has patched it to re-enable PS3 backup support!
Spanish developer Waninkoko has modified the recently released PSGroove Hermes Payload v3 to allow for PS3 Retail PKG File installation.
Download: PSGroove Hermes v3 PKG Demo / PSGroove Hermes v3 PKG Demo (Compiled Hex Codes) / PSGroove Hermes v3 PKG Demo (Compiled TI-84 Hex Code) / PSGroove Hermes v3 PKG Demo (Compiled MaximusAVR Hex Code) / PSGroove Hermes v3 PKG Demo (Compiled OpenKubus Hex Codes) / PSGroove Hermes v3 PKG Demo (Compiled Xplain Hex Code)
According to caravela HERE, this modified payload allows you to install Retail PS3 packages when in JailBreak mode on the PlayStation 3.. just copy the package to USB and install them as you do with the Debug PS3 packages without needing to convert them.
To quote, roughly translated: "Waninkoko has been to work for the Hermes PSGroove V3 has been patched for functionality demos facility a reality.
Here are this modified version with source code, now only a matter of the compile."
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