So far it looks like a lot of users are losing their BD playback capability when downgrading because the downgrade uses debug firmware. There are however some fixes in progress, so I would wait before attempting anything.
apparantly the way to do it is to downgrade to 3.41 using mod pup if you lose your bluray downgrade to a lower firmware using retail pup 3.30 or then upgrade back to 3.41 (normal pup) untried by myself but supposed to work.
thanks for the input so far, but I'm still going to wait until someone can confirm the methods used, anyone out there still has Blu-ray playback with PS3Break let us know, cause i'm sure loads of people would like to know.
yes downgrade to 3.41 with moded pup using ps3 break instructions once on moded 3.41 downgrade again using 3.21 or 3.15 official pup then take your ps3 out of service mode and update to 3.41 with the official pup every thing will work fine i did this for my nephew no problem. hope this helps.