Installing Angstrom on BBB Rev. B with 2GB eMMC

Hello,
I bought a used BBB Rev. B with only 2GB eMMC space. Installed is a Debian image, but i want to install die Angstrom image. I download the latest Anstrom 2GB eMMC image, but it has an extracted size of nearly 4GB and i can not flash it into the BBB´s 2GB eMMC.

Where can i find an image which has a size of 2GB?
What can i do?

Greetings, Peter