We followed these steps to upgrade one of our 3.5.0 environment styles (without changing the environment version): How to Apply the New IBM TRIRIGA 3.5 Look and Feel – Skin. Everything went well for the overall look and color scheme, but the images displayed next to the navigation items (within My Requests or Tools portal, for example) stayed as they were. This is normal considering that new images does not override the existing ones.
We would like to update the navigation icons without having to rename the files one by one. I read somewhere that since the 3.5 image files where imported from the database, maybe the USERFILES table needs to be rebuilt using the new icon paths?