I downgraded to 3.41 and make some mods to flash 2 and flash 3 to rescue BR Play. ZERO RESULTs.
Lost BR movies play, but today i picked a dvd region 4 and insert into JBps3 downgraded region 1. NO RESTRICTION! PLAY without problems.
The dvd isnt dvd-all, never worked before. Now all my dvd collection is working ANY REGION. 3, 4, all, 1. NOTE dvds arent region 1 with other region muxed.
If someone can test it with a normal bad downgrade - without flash mod.
Because mine flash mod was too crazy (stupid) to be a true working.
Sorry my bad english.