Why is my S5 not working after flashing ROM?

Hello, I need help with my S5 mini G800f... This is basically what I did:
- I checked if the phone was rooted with RootChecker, it was OK
- flashed TWRP recovery via ODIN
- tried flashing a total of 11 custom ROMs, but no success, all stuck on Samsung logo
- finally gave up and flashed stock 6.0.1, still no success
- then I flashed CF AutoRoot, and voila!, the phone booted to stock 6.0.1
BUT NO!
- camera now only has 8.0 Mpix
- I can't delete anything from Gallery, all pics appear again after deleting
- no videos will play, with VideoPlayer or with any 3rd party app....

Please help me, I have custom flashed many phones, but never seen anything like this.

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