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Yes Chancer, I can make as i said, a 1m bios containing 2x flashbios
You are missing the point you said
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because i cant find a 512k flashbios file
Yet in the first statement quoted you said you can make a 1mb file using 2 x Flashbios + your X2.
What are you doing ? Just make a 512K bios using the 2 x Flashbios in XBtool and flash it on to the second bank. You are making an easy task in to something difficult with all this 1mb bios and stuff like that. You don't flash 1mb bios of any description to a DuoX 2.