I was there yesterday, July 3 2011, and we took the “wrong” route to reach the crater. I call that wrong because its more dangerous then the route where we get down. on the rock we took the right side, it supposed the left side.
we follow Thomas Ulrich’s route on GPS. And from the crater we climb a litlle more higher, but can not reach the summit, because no equipment. but for sure i will be there next 2 weeks and reach the summit.

I can confirm in additional to Rob Woodall and a mysterious Dutchman named Erik (who our guide told us about), Wolfgang Piecha also reached the true summit of the rim in April 2009 on a Java Lava hike – using the same route as Rob and (presumably) Erik. As did Thomas Ulrich (originally from Switzerland).

See http://www.peakbagger.com/climber/ascent.aspx?aid=131204 for Rob Woodall’s account of his successful climb to the true summit! Sadly myself and Adrian weren’t confident enough on the steep, crumbly rocks to continue up to the very top.