kwakisaki , If I'm remembering right, theres a huge difference on R-30iA and R-30iB PMC file format.
R-30iA has only a file called LADDER.PMC. R-30iB has LADDER.PMC and also PARAM1.PMC.
FAPT Ladder 3 V7 and below can open only the LADDER.PMC that come from R-30iA.
To open LADDER.PMC and PARAM1.PMC from R-30iB, You will need FAPT V8 or above.
So if Your newest FAPT is V7, I would recommend You to build a R-30iA cell and see what happens.