In your earlier post, I have the exact same errors using the GH5 method.
So I downloaded a Universal Unbrick Disc V4 from ps3news.com, extract and
When I boot it from the recovery menu, it booted right into Wadmanager v1.5.
From there it was a matter of using a suitable ios to install the correct wad
to unbrick a 003 Korean Wii.
My first try with ios 249 - error 102x (i forgot the number)
My secong try with ios 36 - installs the wad (cIOS70-v6174-v3.6.wad) perfectly.
Try it, it might works for you.