I have latest executer 2 bios v4976.02 (bin file)
In simple terms how do i physically update my xboxes executer2 modchip with this?

I have evolution x v1.8.3752 and flashfxp.

any help in acheiving this would be appreciated.

first thing you need to do is make sure that your bin is 1meg. if not use x2bm to create a 1meg version of it since your x2 requires a 1 meg image.

copy the 1meg bios bin to c:\bios on your xbox hd

Then use the flash bios setting within evoX and you should be good to go.

Also make sure your flash protection jumper is off before you try it... check out the tuturials in xboxscene