This is my case, I had my 1.1.2OTB and upgraded to 1.1.3 accidentally. Somehow I managed to downgraded it to 1.1.1 and use it as an ipod.

Now I've installed the Oktoprep for upgrade to 1.1.2 but it fails to upgrade, it does not accept any firmware. Is there a way to virginize this version, I mean to completely restore to factory defaults?