Actually, I found a Phillips 0 (PH0) a better option on all the smallest screws than a PH00. That was at least my experience.
On my computer there is only one 4mm screw. The leftmost bottom right. The others are 3 mm. It is actually written on the shield: M2X3 = 3 mm. M2X4 = 4 mm.
on my model, the upper yellow screw and the orange screw were 3mm as well (red colour). So only the one right yellow screw was 4 mm.
I found it easier and "safer" to use a spudge at the back as well (two on each side of the hinge)
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