Default Help, problems with media scan 4.4.2

Hi, I have a S4 i337m, from Mexico, telcel, I manually updated my rom to a black edition samsung official. After that I started having some troubles, music player errors, the gallery doesn't read the new pictures, etc. I tried other roms but it doesn't work, I had to download an app and did the scan manually.

What can I do to go back to normal? Thanks!

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