Here is what I did:
SystemMenu 3.3Uv1 (so IOS30 is trucha patched).
No previous IOS16 on the system.
I obtained IOS16 v512 using NUS Downloader v1.1 and packed it into a WAD. Installed that:
Title=1-10 (IOS16) vers: 2.0 (512)
Using Sorg's modified WAD Manager 1.4 I attempted to install...