You need the JIS (Japanese cross head) screw driver for Shimano gears.
https://www.motorcycle.com/ask-mo-anything/difference-between-japanese-jis-phillips.html?amp
Sealy do a half decent set for not a lot. I’ve got a set kicking about somewhere, but can never find them when I need them!
https://www.toolden.co.uk/hand-tools/screwdrivers/sealey-ak4314-jis-screwdriver-set-4pcs/?gclid=CjwKCAjwg5uZBhATEiwAhhRLHpSeylXaax2ww3g3fxwnD3B0-mr2oU9K3g718GXDpZVnZNh7yOJjVxoCzwQQAvD_BwE
@Chaley started
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You need the JIS (Japanese cross head) screw driver for Shimano gears.
https://www.motorcycle.com/ask-mo-anything/difference-between-japanese-jis-phillips.html?amp