How to "explode" AutoCAD® blocks that don't allow you to "explode"

1. Select the "Block" want to explode. Enter the command LIST on the "command line" and press Enter.

2. Check the name of the "Block" you want to explode.

3. Enter the command BLOCK on the "command line" and press Enter.

4. Select the "Block" you want to explode from the "dropdown menu". Thick the box "Alow exploding" and press OK.

5. It will appear a "new window". Select  the option Redefine block.

Now you will be able to explode the "Block".