You probebly haven't looked at much spiderchip info then...

The only bios that works on it is m8_16 or m8plus_16 and since his is a 1.6b (most likely) he needs to use m8plus_16... unless the one your talking about is just the same that i speak of just hacked with some new images your wrong... it has to be 256k also because thats all the spider chip has for memory...

I have read numerous articles/posts of people trying x2/x3 bios and others of the sort and they blame it on the chip... talking bad about shit that was there fault in the first place. so even if one might work i would recommend doing the m8plus_16 for the fact that if you try one and it doesn't your screwed... spiderchip is a one time flash with 1.6boxes and if you fuck it up you have to get a programmer or find someones xbox to throw it in 1.0-1.5

My 2 cents

Edit: Also Terry Bogard if you have a 1.6b you might have to invest in a fiberglass pen to scrape some of the laquer (sp?) off of the board... microsofts battle against modchips was to cover the holes with clear coat lol... later