New (Old) Register needs upgrade before starting

I am connecting a register that I bought in spring 2025 but never used.

I am trying to start it up but whether I try to login with username & password or with a device code I get a popup that says "To access your account, please upgrade your device. You can do this via your settings."

 

But when I go to settings (on my computer) it won't let me add that register.

 

Help! Thank you!

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