Samsung SGH-i777 a.k.a AT&T version of the Samsung Galaxy S II. Below are the links to download the usb driver, Kies updater software and detail guide. Model number : SGH-I777ZKAATT (SGH-i777).
USB Drivers for AT&T SGH-I777 Galaxy S II AT&T
Device install, USB Driver (Software) Win XP, Vista and Windows 7 (Seven) ver.1.3.1650.0
File: Zip
Size: 3.66 MB
Release: Sept 27, 2011
(copy the link and paste into your browser)
http://downloadcenter.samsung.com/content/SW/201109/20110928044301055/ATT_i777_GS2_USB_Drivers.zip
SAMSUNG Kies, Software for Windows (XP, Vista, 7)
(ver.2.0.3.11082_152_4)
Managing content on your mobile is easy with Samsung''s Kies 2.0. Kies keeps your device firmware updated whenever you connect, helps transfer media and files between mobile device and a computer, etc.
File: exe
Size: 82 MB
Release: October 11, 2011
Detail guide:
http://www.samsung.com/us/support/SupportOwnersFAQPopup.do?faq_id=FAQ00029018&fm_seq=29186
Download Samsung Kies for Mac OS
Samsung Kies for Mac OS 10.5, 10.6 - SAMSUNG Kies (Mac),Others (Software) (ver.1.0.1.11095_18_2)
File: dmg
Size: 15.91 MB
Release: October 11, 2011
http://downloadcenter.samsung.com/content/SW/201110/20111012042921965/KiesMac_1.0.1.11095_18_2.dmg
Detail guides : http://www.samsung.com/us/support/SupportOwnersFAQPopup.do?faq_id=FAQ00029018&fm_seq=29186Galaxy S II AT&T Manual:
http://downloadcenter.samsung.com/content/UM/201110/20111001052118325/ATT_SGH-i777_GalaxyII_English_User_Manual.pdf
You can visit link below to find how to install and use the Kies software to update your Galaxy S II (AT&T)http://www.samsung.com/us/support/SupportOwnersFAQPopup.do?faq_id=FAQ00029018&fm_seq=29186
To download driver USB and Kies Software for Sprint version of this phone (Samsung Epic Touch 4G SPH-D710), please go to: SPH-D710 Samsung Epic Touch 4G USB Driver Download