Hi! I´m really new in Android, I had before an Iphone.

So, I´d like to know if firmware´s upgrade for GT-I5800 is the same for GT-I5801?

I tried to update by KIES, but when it looks successful, the program stops
and appears error "It´s not possible to finish upadting firmware".

I´m not sure how I can proceed. Could anyone give me a help? I need to
know about tutorials, tips and what it means ROM, BOOT, LOADER etc.

Thanks.