has admitted Mercedes' long-awaited upgrade package is not a magic cure for his struggling car.The 37-year-old was speaking ahead of this weekend's Spanish Grand Prix, the second outing for the revamped machine. It carried him to sixth in qualifying in Monaco a week ago and fourth in the rain-affected race. qualified eight and finished fifth.Hamilton had previously said he was 'counting down the days' to the upgrade's arrival, but has now diluted his enthusiasm, conceding: 'It is definitely not the step forward we were hoping for.
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