Selling my old android - can't encrypt? What to do before sale?

[Whib96]

Trying to prep a pretty old android device of mine for sale because I no longer need it. It was an MP3 player and did not even contain a cell radio, so there were never any phone numbers or anything on it. It's running an unofficial build of CM10.2. I'm guessing because it's unofficial, the encryption option does not work. The little green outlined android figure comes up but that's it. I can simply hit the back button or home button and it's like it was just viewing an image. I did a factory reset so all my stuff is wiped from the UI at least. Admittedly, I think it's low chance that anyone would dig so deep on my device to find something like my dropbox password, but it does worry me a little. Any idea what I should do here since I can't encrypt?

 

[Rukbat]

Reflash the ROM. That will do a full wipe of the data partition.

 

[gone down south]

Change your passwords.... Which you're doing every few months anyways, right?