Rapide air filter changes

[Aml21s]

Hello, specially on the rapide its a bit different than the db9, i am able to unscrew 6 screws but not the 7th one, i bought a flexible screw driver but i am unsure i can do it with this tool, or if i need an articulated screw driver, anyway, this is without removing the under plate as i do not have a lift now.
anyway, i could change the oil and filter today but i got in trouble removing this 7 th screw from the air filter box, any tricks or idea or tools that i need to ease the process. i only lift the car of 33 cm as my ground is not flat and its not great doing so.