If this is true, then I am definitely not purchasing the MKII from Gp2x.co.uk. I was totally gonna buy the 275 mhz version! I will stick to my trustworthy 2nd edition that I can actually angle towards my line of vision, lol. I hope this is not the case with all MKII's. Where is the MKII...
rename uni-bios.rom to aes-bios.rom, then change your system type to Home instead of Arcade. You will see the Unibios Start Screen when loading. Then Start+Select to Enter.