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I think the blue and yellow button is for the parental control pin, whereas this might the be the Owner PIN. Since it upgraded is it asking you to reset and enter a new PIN?
If not, have you tried 0000?
Failing that you may need to return to Shipping Condition (all settings inc. programmed recordings will be lost):
FUNCTION MENU>Others>Setup>Initialsie> Shipping Condition
I hope that helps, Best Regards,
Do you require any further assistance?
If not, I hope my answer was helpful and if so a positive rating would be much appreciated.