Actually you just need to feel inside by the catch and push a lever either to the left or right to release a hook that stops it flying up in the event of the bonnet release lever been pulled by accident when driving.
Renault Man
March 2011
You could try a crowbar.
DB
March 2011
Hi there
Use a big hammer
Renault Man
March 2011
I can answer this question...
how do I get the bonnet open on my Renault Megane?