PS5: MP4/A53 Dumper release by Astrelsky + a53.elf dumps released

 Not an actual PS5 chip

The PS5 scene has been moving at quite a fast pace recently, and today we’re seeing the release of a utility to Dump a53.elf from the A53 Processor on the PS5. Following this utility release by Astrelsky, dumps of A53 Firmware have been published.

What is MP4/A53 in the context of the PS5 and why does it matter ?

MP4/A53 is an ARM Cortex-A53 Chip on the PS5 that handles “various tasks”.

The PlayStation dev wiki tells us that its overall purpose is not fully understood. Some of the things it includes are debugging (mdbg), video encode/decode, and other various memory-management related things.

But several hackers have stated that MP4/A53 on the PS5 is involved with decrypting, installing, and/or running PS5 games. It is believed that better understanding of this chip’s firmware could lead to FPKG (“Fake PKG”) support on the PS5, or in other words, a convenient way to install pirated games (and, down the line, homebrew as well, but I’d be naive to think this is the real motivation for most people).

It is worth mentioning that pirated games are already a possibility on the PS5, but FPKG support would make it much more convenient to install them. FPKG support might be pie in the sky though, as lots of other things need to be figured out to bring such support to Jailbroken PS5s. Astrelsky has summarized it on Discord recently:

While it could lead to fakepkg, the level of re and effort required to do so is relatively high. High enough to the point where I feel comfortable releasing it knowing none of you would be able to do it. Besides, flatz said he was looking into another way that should be easier. Also the write memory sdbg command was added in mp4 at some point between the prototype and 4.50. so some lower versions may not even be able to write to mp4 memory this way. Which is unfortunate because it’s very convenient and they even flush the instruction cache for you.

Download MP4/A53 Firmware Dumper & Dump files

Generally speaking, the dumper itself will not be useful for the vast majority of people reading this, in particular considering that most firmware revisions have been dumped by now. For people looking into reverse engineering the A53 Firmware, the dumped ELF files for each firmware revision are what you want to look into.

• A53 Dumps (ELF Files for PS5 Firmwares 4.02 to 7.61) – source Zecoxao
• Dumper source code (initial release by Astrelsky, not cleaned up yet) – for binary payloads head over to the PS5 R&D discord