Decrypt android device (CM13/6.0) I encrypted my device on a lark, but it affected performance too much. I want to decrypt my device, but the place where I could previously initiate the encryption now just show "encrypted". I tried a factory reset both from the setting and from TWRP, but after the device boots back up, it's still in the encrypted state. Tried several times.
You will have to wipe userdata using fastboot mode. 

fastboot erase userdata