The most recent firmware version for the ex3 is v 1.04_0084. 1.03 fixed the focus issue, 1.04 added a flicker reduce setting. If you search "1.04" in the forum, you'll get more updated posts than in this thread.

The EX3 firmware patch version 1.03 was the first update to address the focus issue. 1.04 includes that plus another fix.