I moved the contents of the dmg file to my root dir (/) before executing the run_this file

EDIT: the soft upgrade crashed and now my iPhone is in DFU Mode… so it's either back to v 1.1.2 for me or wait till someone recommends sth :)

EDIT2: thanks to a well known IRC Chan, I now know that it is possible to have a "legit"; 1.1.3. upgrade jailbroken (including the new baseband). Today after work I'll do some more stuff :)