206 Rear Speaker Removal

Friends I removed the rear door trim to replace the rear speaker of my 206 vehicle. But I couldn't disassemble the speaker. It looks like it is riveted from the corners so there are no screws. Does anyone know how to remove these rivets before they get out? (I worked hard with the rivet in the upper left, I turned right and left, but it didn't work anyway)

You can easily smash the rivet heads by attaching a 5-6 drill bit to the drilled drill bit, aluminum is a smash without breaking.