Sorry, no way.

not exactly the response I was going for when turning over my passport at the border post in Zhangmu. The group splitted in Lhasa , the tour group visa original was supposed to be at the border... no .
After being shuffled around for an hour , there is response from the agency in Lhasa : "oh , the visa , we left it (hold on to your hats ) in the chai shop" .
The Chinese guards almost smile when we leave.