There is no such thing as a 1.6 bank, and there is no second BIOS bank on the DuoX3 - the DuoX3 is a cheap clone that only has one 256kb bank.If you want to flash iND-BIOS.5003 to your single bank then try using HeXEn (Google Heimdall's Xbox Engineering Disc) to flash your chip - it has support for more chip types.