It seems that early adopters of the PS3 downgrader are experiencing issues with Blu-ray playback on their consoles. According to Mathieulh, the reason this happens is because some files are replaced with those from a debug unit which do not support blu-ray movie playback. It is unclear at this time whether this broken functionality could be fixed in the future or not. Looks like you’ll have to determine which is more important to you right now, blu-ray movies or homebrew.

Blu-ray Playback Issues [@Mathieulh]

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