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Bought a G4 receiver with share from someone on here but I keep getting an error message- ERR69 AND ERR121 it says to call tech support any ideas on what the error is? I tried resetting it on back

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I'm a mom supporting a child with type 1 diabetes since 2013.
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I’d suggest calling Dexcom They will walk you through resetting it They need you to plug in a usb to your computer to reset it