"Invalid Signature" message?

I just received my MC8 and plugged it in and I can’t get it to not show “Invalid Signature” on the screen. I can’t seem to do anything with it. Anyone know what’s up?

Hey @jmarion, did you manage to solve this? We have responded to your email

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I dropped you another email regarding this issue. Do check your spam mail if you don’t see it, thanks!

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Please, how do you fix this. I got the same error but with the MC3!