To unclip requires a special removal tool that came with the louvre. No other method will work as its a security feature also.
The large adhesive strips feature plastic posts that stick up. They have squeeze sides protrusions that are the lock.
The tool is a round piece of plastic rod, the outside dia and inside dia are important as it fits in and presses the side protrusions in and hence it releases. The tool can be reproduced.
I might (or might not) still have the small black plastic tool, I’ll take a look.
