Which FS /Firmware is the standard for the Sony Ericsson (by standard I mean the one and unlocked/unbranded w580 would come with). Is the America_2 standard or is it user created?
The MAIN firmware you used is an unbranded (standard SE) firmware. There are several FS versions, but the only difference is the different language support(no more, no less). And yes America_2 FS is created by SE like any other FS.