Board Thread:Support Requests - Designing Your Wiki/@comment-4829508-20131213232358/@comment-168424-20131214055426

Better instructions (only work if you're an admin):
 * 1) Go to w:c:aquapets:Special:Log/delete
 * 2) Click the red link for the deleted image (File:Someimage.ext)
 * 3) Click the little triangle to right of "Create" drop-menu button (usually "Edit" if the file exists)
 * 4) Select the item that says something like "Undelete # edits"
 * 5) Scroll down to the "File history" section
 * 6) Optionally Click the date/time to see the image uploaded at that date/time
 * 7) Click the checkbox to check the image you want to restore
 * 8) Enter a "Reason" and click the Restore button

That should do it.

I'd have to say, TK-999 had you down the right path, but the path was weedy and full of misdirection.