My device won't hard reset

I have had problems in the last few weeks with my micro sd. I posted in 'android general' about this, I want to switch back to the normal partitions. In the past, on XDA I had found a 'fix' that would switch the mounting of microsd and local mass storage, making the microsd the main partition (to the eye of the device, the microsd would become the internal memory, and apps would be installed there automatically).

Anyway, never installed any rom on my phone, only the root. I tried a hard reset today....I went to the configuration (language and account setup) now the phone shows a black screen, you can see (and interact with) only the status bar. A popup telling me about an update came up, I did the update (67 MB), reboot, and then the message: couldn't update the device, try connect to Kies.

Screen still black with only the notification bar (that works, wifi gps buttons etc,). I could go into the options, and see that the microsd is still seen as main memory (switched).

Basically I have two questions:

- why didn't the hard reset work?
- how do I switch microsd and internal memory? I tried looking for the file but I can't remember which one I did edit

And third:

- how do I get out of this ? the only reason why I did the hard reset (microsd not working, switching microsd-internal memory) is still there, so how to say, I in an even worse situation now.