Jul.29 (GMM) Mercedes has pressed rewind on some of the technical improvements that debuted on the W01 car last weekend at Hockenheim.

After Nico Rosberg finished on the Silverstone podium, the Brackley based team brought further tweaks mainly to the blown diffuser and F-duct to Hockenheim.

But the 24-year-old German, and his famous teammate Michael Schumacher, were off the pace at their home race.

"We have taken a step back," Schumacher is quoted on Thursday by Auto Motor und Sport.

The 2010 car will therefore run in Hungary in effectively the Silverstone specification, while the problems with the latest improvements are investigated.

"We will compete again with the full package at Spa," said the seven time world champion.

Rosberg admitted to some frustration.

"Every time we have a major update, something goes wrong," he said in Hungary.

"In Valencia it didn't work out, until we got it right at Silverstone," added Rosberg, who said some of the problems with the Hockenheim specification have been solved for Hungary.

"Hopefully for Spa the problem will be fixed completely," he added.

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