Neither the translation nor the original Japanese rom will prompt me to save with SRAM. Does the NES Powerpak support MMC4?
Maybe check the
iNES header for the necessary PRG-RAM and battery option? (Nestopia has a header editor that can do this in its file menu.)
I haven't tried FW; but I tried both FE games and they both worked perfectly with the PowerPak, so MMC4 is definitely supported.
10$ that the battery backed SRAM byte is not set in the header. Many roms from the Good and No Intro set have wrong header and some even missing one altogether.