The window handle is broken. What should I do if I can't close the window?

1. First, open the back cover of the handle to expose the internal screws.

2. Then rotate the back cover about 90 degrees and unscrew the screws with a screwdriver.

3. Then remove the handle to see if there is rust or damage inside.

4. Finally, install a new handle of the same model in the corresponding position, fix it with screws and cover it.