SPOILERS HERE

on last quest i have entered the radiated room and entered code 216( i guess that activated project purity) and my character dies. I read that if you have broken steel dlc that you can continue playing after ending but my character dies and i get movie and back to main menu able to continue my last save before ending. I have goty edition so i have broken steel and at beggining of game i got message that broken steel is activated so how do i continue playing after this?

If you do the last part of the main quest with Broken Steel installed then the game doesn't end.

If you've already ended the game you need to do this bit again as it changes the end sequence!

it's goty edition so i had broken steel installed from beginning i checked it in data files and after i exit vault 101 i got the broken steel message 15 hours of gameplay later i finished the main story and i though i could continue because i have broken steel installed, but it ends anyway.