How did Boba Fett lose his helmet in Dark Empire II?
Boba Fett had tracked Han Solo to Nar Shaddaa. There he had them cornered. He thought he would capture them again and bring them to the Hutts but he was surprised by Chewbacca, who wad snuck up behind him. Chewie, in the struggle, ripped off Boba Fett’s helmet (his face is in the shadows) and ignites his rocket pack, sending him into the ceiling.