in xbtool i need help with the file operations which are the ones i use? there are size, unpack, pack, open, save as?

and which of these bios files do i use with xbtool?
evox d.6 bin file
evox d.6 ejectfix bin file
evoxd6_MP bin file
tsop d6 bin file

if someone can tell me how to make a new bios using xbtool and that i can use a 250gig hdd
I WILL BE TRUELY GREATFUL

for this to work i have to reflash my mod chip with this new bios