r/u_HotExternal8002

I bought this 3DS XL/LL from Mercari, so it’s pre-owned. Unfortunately, it’s not working. I’ve factory reset it, changed the DNS multiple times, and even changed my connection at least four times. Every time I try to update it or perform any action, it triggers that error code. I’m completely at a loss for what to do or how to fix it. Please help me out! 🙏🏽