By the way you cannot use both at the same time. It has to be one or the other. There's 2 versions of the gamesd.skprx. One boots memory card as uma0 and sd2vita to ux0. The other one boots memory card to ux0 and sd2vita to uma0. A little work around is having both these 2 different versions stored say in ur0 (so it's next to the tai folder) in separate folders. One called memory card and one called sd2vita. When you wanna boot your official memory card you go into vitashell and just copy the memory card ux0 mounting gamesd.skprx to the tai folder and restart your vita from inside vitashell. This then will load up your memory card. Then when you want to boot the sd2vita as ux0 you just go back into vitashell and copy the sd2vita gamesd.skprx to the tai folder and reboot again.