If you are not experiencing any problems, a new BIOS will not gain you anything, especially performance, and flashing is a big risk to take for nothing gained. My advice: don't f with things. And if you do decide to do it, for heaven's sake don't flash from Windows using winflash!
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G74SX-CST1-CBIL, i7 2630QM 2GHz
32GB DDR3 RAM @1333MHz
GTX560M 3GB DDR5 (192 bit)
17.3" LED 1920x1080
Sentelic TP, BIOS 203
Debian Linux Wheezy (Testing) Kernel 3.2, NVIDIA 295.40