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wrong bank man, Bank0 is the correct one for your version xbox.
It does not make any difference which bank you flash and use on a 1.4 white DuoX 2. as long as you flash the right bios for your Xbox you can use any bank you like.
You now have to boot from bank 0 with a program called Eurasia. You can still flash the bad bank by flicking the switch to bank 1 just before you start with the bios disc.
Make a new bios disk with your 512K bios file on it when you use Eurasia. You can use the M8+ bios if you like as long as you don't use the M8+.16 version. Mkae sure the bios size is correct on the bios disc.
Maybe on the first flash you used a 256k hence the problems.