unfortunately the flash has gone bad from my Sandisk Sansa Clip Zip. But at least I could figure out how to enter the recovery mode. It is not in the Wiki yet and should be added. Actually I am to lazy to request a wiki account only for this ;-). It is meant as an addition to this page: http://www.rockbox.org/wiki/SansaAMSUnbrick
Here it is:
(if you open the image you will get a the original size).
Note that the grey stuff around the display is adhesive, so be careful. There is also a ribbon cable that goes from the buttons to the connector beneath the Sandisk logo. So carefully lift the grey bar to release the flat flex cable and then remove the front case.
I could only see a 32 MB partition, but on a working one this could be different.