If you follow the guide, one of the very early steps is to install Bootmii and make a NAND backup.
If you are able to install Bootmii as boot2, you will effectively prevent your wii from being 'unrecoverable', as you will nearly always be able to restore your NAND backup.
Having a hardmodded wii is completely irrelevant as to what softmod process to do.
Just follow the regular guide, and pretend you don't even have a modchip, it'll make zero difference.
Just wanted to say, been playing with this today and it's truly fantastic. Everything worked first time out of the box, and I'm enjoying some Wiiware that Triiforce struggled with in the past. Beautiful!
Start > Control Panel > Administrative Tools > Computer Management > Disk Management
Then right click on your FAT32 partition, and set it to active.
If you havent done this, that'll be your problem right there.
As I understand it, Triiforce has a limit of 256 WADs currently.
Start by just installing one or two wads until you get it working.
Stick every folder created by SimpleFSDumper on to the root of your FAT HDD, install some WADs to it with ShowMiiWads, and choose USB-NAND when starting up...
Create dump with Simple FS Dumper
Stick all the folders created by it, to the root of your HDD.
Use WadManager 1.5 to install the wads, choosing USB-NAND emulation when prompted.
Start Triiforce
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PROFIT!!