I tried to add a key on a Smart 453 year 2015. But Lonsdor K518ISE reads flash up to 73% and stops. Timeout. Tried several times, 73% was the highest score. I really thought that Lonsdor can do it.
I tried also under Renault twingo 3, but same situation.
At the end solved 453 by Lonsdor
So tried by flash reading/pin reading by Vivaro traffic.
Successfully done.
Also deleting/flashing.
https://www.obdii365.com/wholesale/lonsdor-k518ise-key-programmer.html
Maybe it’s helpful for other users.