Thanks for this guide.

I managed to open 2 of theses and swap the sensor-unit from one to another.

Unluckily the camera remains broken since one only shows a black picture - even though the sensor is alright an the other has a broken AF from a fall, I suppose...

I am certain with some silicone grease on the orange rubber the camera would still be waterproof.

Start with a metal spuge from the buckle on the lens-side and work your way from there.

Its not necessary to remove the whole thing - cause the side on the other buckle tends to break.

It's a T4 on both my cameras