Hi Ayush, don’t worry, your Nord is fine. The way the smartphone is built, you can't damage anything with the opening tool. Inside the phone the microphone is oriented upwards at a 90° angle so you can’t reach anything with the sim opening tool. [br]
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Here is an interesting article about the topic for you, check it out: [link|https://www.ifixit.com/News/32804/why-you-cant-really-damage-your-microphone-port-with-a-sim-eject-tool|Why You Can’t Really Damage Your Microphone Port with a SIM Eject Tool].