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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.
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i have the same setup, havent flashed it yet, have just downloaded eurasia but want to clear if 256k bios works with eurasia
No Eurasia does not resize the bios for you. You have to resize it to 512K or you will end up with a bad flash.
Also only use Eurasia when booting bank 0. If you boot bank 1 it has normal flashbios on it so you only need a bios disc.