[AC Question]

I was using encrypted 4.4.4 Android. I had to decrypt to update to Android 5.0; after update my phone had not automatically encrypted it self as Android claims it to as it doesn't decrypt when I power it off and then it back on. On the worse side my phone is the only Android 5.0 phone with a ''missing option'' of device in the security menu under settings. My phone doesn't even have an encryption option now. Kindly give me a solution to the problem as I want to shift my lenovo A6000 back to official factory rom of 4.4.4 add it was much much more secure.