I have a tutorial here, no files unfortanatly those you must find on your own.

There is a couple threads on posted dev_flash3 files these ARE the files you must get to fix blu-ray from downgrading. Also you must replace your xRegistry.sys

So If you are using ACID CFW, or any other edited xRegistry.sys then you must replace that with an original xRegistry.sys file.

The xRegistry.sys file can not have any debug settings enabled or blu-ray stops working. if you want to play around with that to see for yourself be my guest, I would personaly like these options enabled, but to play your blue ray you must be on a "nilla" xRegistry.sys

So recap:

Find dev_flash3 for your region/make/model

Ftp over dev_flash3

Find Original stock xRegistry.sys

Ftp over dev_flash2/etc/xRegistry.sys

Reboot PS3 into Normal Mode

Enjoy PS3-blu-ray


Edit:

If you want to use awsome mount point manager, or another I believe you could map the xRegistry.sys to a new folder, so in your JB mode you could have a custom xRegistry.sys for use