any updates on this as I have just acquired one today?Sorry to disagree but i think it might please you to know ...
Your info is a little outdated m8
Wii backups have been playable for a long time via a softmod hack and adding the homebrew channel in vWii mode to install all the old Wii hacks and tools but the main Wii U has remained locked up, until recently when Loadiine (a wiiu backup loader) was released.
It's early days tho so to answer the OP no, you can't load isos from HDD, you store them on an SD card And no it's not a simple process yet, it's still at enthusiast level I'd say atm.
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