Aha! I thought I was replying to DacoTaco. I didn't see it was you asking about de the SDcard.I just had the idea to test with sd instead of USB, but that's where my trouble shooting knowledge on this issue ends, so I will defer your other questions to the reigning expert, Daco
Edit: to be clear, you tried it with an SD card AND the wiimmfi patch v2 added back so it now successfully appears in your list of priiloader hacks?
And yes I did try with an SD and the WiiMMfi patch v2 back in hack_hash.ini. It seems to be working in that situation.