A Step by Step instructions for upgrading your i780 from 6.0 to 6.1

Notes. This is i think for asian i780s

Installers
For XP
For Vista

Modem drivers:
For XP
For Vista

1) download modem drivers then install.
2) download installer
3a) backup your data (phone if you want)
*optional 3b)hard reset phone prior the the upgrade. your previous tweaks may not work for 6.1 and can cause conflicts.
4) connect i780 to the pc via active sync
5) click installer
6) follow instructions.
7) after all the instructions your phone will reset then you will see it updating if after reset the phone does not upgrade trying switching to another usb and repeat step 5)
8) after installation of 6.1 unplug the connection turn the phone on.
9) tada your on 6.1

Use at your own risk and dont blame me for bricking your phone.

You can always send it to Samsung service center as an alternative of doing the upgrade yourself.