I used this method as rewritten in my post myself this afternoon, i went from 3.4e to 3.2e within 7-8 minutes.
it worked 100%
Just found out cioscorp installer blindly installs whatever is in the cioscorp folder, thus we could put wads:
1c - IOS9-64-v516.wad
1d - IOS17-64-v512.wad
1e - IOS20-64-v12.wad
1f - IOS21-64-v514.wad
1g - IOS28-64-v1288.wad
1h - IOS31-64-v1040.wad
1i - IOS33-64-v1040.wad
1j - IOS34-64-v1039.wad
1k - IOS35-64-v1040.wad
1l - IOS36-64-v1042.wad
2a - IOS30-64-v1040.wad
2b - SystemMenu-v290.wad (FOR PAL ONLY)
--=or=--
2b - SystemMenu-v289.wad (FOR NTSC ONLY)
--=or=--
2b - SystemMenu-v288.wad (FOR JAP ONLY)
in the cioscorp folder and the guide would be:
run wad man
install cios16
run wad man custom
install cios249 r7
run (modified) "cioscorp installer" making sure ur correct region sysmenu is in there
Done