Can't decrypt - JellyBam / 4.2.2

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http://forum.xda-developers.com – Hi guys, I've used quite a few roms with my i9300, always using androids built-in encryption (I've got work mails on this device). A while ago, i decided to give JellyBam a shot - and yeah, I like it, but I just want something new from time to time, so I wanted to flash another rom. As always, I wanted to decrypt the device after backing up everything, then flashing the normal way from recovery. Unfortunately, it just doesn't give me the option to decrypt it - its simply greyed out. I already tried removing EVERY single account, not only exchange, so I'm quite certain this doesn't bl (HowTos)