have you applied the patch for the emmc secure erase bug, aka "superbrick"?
my phone has a chip potentially effected by this:
has the kernel patch been applied in replicant? for which version?
if you'd like, i could create a brief warning on the install page, like the one at the top, here: http://wiki.cyanogenmod.org/w/I9100_Info
i'm currently investigating whether i'm having issues related to this... (i'm not currently using replicant, but i used to.) thanks!