Hi, I installed the firmware update 4.4.8 released right after thanksgiving and it helped my dual 1ghz mirror door purchased last september. The fan is still noticable, but there's no loud (vacuum-like) start and stop, it just runs consistently at a lower level. It used to shut off and then kick on at a very high/loud level, and now it doesn't. I don't remember how I did it other than following the read-me file's instructions and being successful on the first attempt. good luck!