I know this is an old topic, but I recently did this myself and took pictures, so I figure that even if it's too late to help the original poster, it could at least help some others.
Removing the supercapacitor in the IFU-30A frees up its ground via to solder the additional address lines to to ground them.
An original IFU-30 is the same procedure as the IFU-30A, just in a different place with different grounding points available.
IFU-30A

IFU-30
