Phone saying CUSTOM on screen after restart and connecting to computer. Help?

[Android Central Question]

I recently connected my computer to my phone in order to try and recover a lost text message I needed. Now when I restart my phone there is a unlocked icon and says custom on restart screen. Also new icon on top i dont recognize, looks like two half circles together, slightly separated. i also now get an error message saying an unauthorized actions have been detected, please restart to remove. But error message keeps popping back up after restart.

Just want to go back to normal. If anyone can help,I'd greatly appreciate it. Thanks.