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Decrypting my Galaxy S3
I recently upgraded my galaxy s to a galaxy s3. My company rolled out this Google Device policy that makes me encrypt my phone, set up really annoying textual passwords, and a few other security settings to supposedly protect my phone. When it came time to root and apply a new rom to the phone, I could not, because CWM couldn't format or overwrite "/data" on my phone.
I wrote a blog post on how to decrypt your phone. Unfortunately you'll have to start from scratch and you won't get to save anything that isn't backed up externally. The phone's file system is permanently encrypted. I tried a few things like "unregistering" the device and removing the accounts, but it would never decrypt successfully.
Here are my instructions:
enerjee How to DeCrypt a Samsung Galaxy S3
Long story short - flash a stock rom with ODIN. Then unlock the bootloader, install a new recovery, and flash with something better.