Hello I have the oneplus one and I have been loving it. I recently decided to put CM12 on it. I was able to load that on and get it working. All well and good, but I hate the CM12 and want to go back to CM11, I tried using the CM11 files to go back, but there is a certificate error when it tries to install CM11. I cleared my data and I am backed up. Can anyone help me?