Leica Camera AG have released firmware version 1.174 for the Leica M9, claiming to have solved the issue that would render certain SD cards unusable, as well as corrupt their contents. You can find an official statement, a link to the new firmware as well as a recap of the original story over at Leica Rumors. Certain SanDisk cards still remain problematic in use with the M9, though, so make sure your card is compatible before using it.

The new firmware is being discussed in the German and English sections of L-Camera Forum.