Yeah, you did. And that's why I gave you that response.
Right...Now that we have that out of the way, search for Hopper8's 'Odin troubleshooting' thread. I don't think the link to 3 part firmware in the thread is live anymore, but the first thing I'd be doing is trying to hunt down any I9100 3 part stock firmware (not 4.0.4 though) & flashing that. Rationale being as it will wipe your phone, maybe it will remove remnants of what was previously on the phone & which may be causing problems. It's a longshot, but worth trying given the alternatives.
I'd also keep flashing stock firmwares (as many different ones as you can download), and go through all the troubleshooting steps in Hopper's thread. There's always a chance something simple/obvious is being overlooked which is tripping you up, which is easy to do if you've been at it for ages & have had no joy getting it fixed.
If after having done those things the situation hasn't changed, take it to someone who does JTAG's, and if they're prepared to have a look at it on the basis of 'you only pay them if a JTAG is possible' (I know a couple of repairers near me who do this, YMMV though), try that. It's unlikely to work/be possible, but worth trying.
If it isn't JTAG'able, then you either look at motherboard replacement as per my PP, or a new phone, as it's obviously a case of NAND corruption.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?