Problem after changing filesystem

I bought a samsung S7 and installed / e / (herolte) on it.
After installation I had an error “Encryption unsuccessful”, with only a “reset” button that did nothing.
Following the post read here, I changed the filesystem to exFAT.
I got a success message, but the screen froze.
I ended up forcing the shutdown and now I can’t restart.
Whether I boot normally or in recovery mode, I get the black and blue “TeamWin” boot screen and the boot never completes …
I do not really know what to do anymore.
Thank you for helping me !