Htc Desire 816 Stuck On this build is for development purposes only topic

hi everybody ! I had a problem on my htc desire 816 with google services to resolve this. i do somtings and now on the device this build is for development purposes only.Do not distrubute outside of HTC without htcs written permission. failure to comply may lead to legal action. cant boot into the bootloader. and cant turn the device of. please help me !