Bump, I have the same question. My MR6400 is buggy, maybe this would help?

My MR6400 already has magic & ttl, will this be lost if I upgrade the firmware?

I have a MR6400 I've modified which worked great for a few months, but has started becoming buggy. Maybe it was all the time and I just didn't notice it. I thought perhaps it was a bad battery, and low-power issues were causing the buggyness, but I bought a new battery and the problems persist. Like ...