Breitling Aerospace Avantage screwdriver

[EaglePilot]

Hi,

I tried to find on the internet/forums etc about information of which correct screwdriver size to use to open the caseback (6 slotted screws, and I dont want to damage it with wrong tool ) of the Breitling Aerospace Avantage (E79362) but couldn't find anywhere!
I want to change the battery myself, but surprisingly couldn't find anywhere information about the correct screwdriver size and type (normal or T shape) to use. The caseback slot screws seems to be really shallow in depth.
The same question about the correct screwdriver to open the 2 really tiny slotted screws on the inside battery cage!
Is there any good soul to help me?