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This is a project to understand and modify Sony Blu-ray BDP firmware. I started looking only at the BDP-S390, but this has branched out to include other players and a variety of goals.
This project has been used in security research by NCC Group researcher Stephen Tomkinson, who identified concerns about the security of blu-ray players.
The source tree for my tools is available here.
Possible reasons for downgrading:
Sony uses an obscure format for firmware updates
For some MediaTek players, including many Sony and Panasonic, there is a way to run arbitrary code without modified firmware. You can read Matthew Garrett's post here.
These are my instructions for building a shared library to give you access.
Some of these are incomplete, or works in progress.
Downgrading has been successfully tested. That's all I can confirm. Modifying firmware is risky, may violate EULA agreements, and can potentially brick your Blu-Ray player. Please try this at your own risk!
Copyright © 2013-2014 Malcolm Stagg