Hi mate, I know from different forum, but this is worth looking at and maybe making into a guide also for vix.
Used yonks ago when had h9t, involves sd card (not usb) a script and all done.
https://www.opena.tv/air-digital-zge...ootfs-8gb.html
If you prefer over Flash Expander plugin itself and wanna use SD for flash and usb / external 3.0 as /media/hdd etc.