Samsung Galaxy SII I777 Unlocked Done.

Procedure:
Write rooted firmware GT-I9100_XXKG1_rooted.oct.
Connect powered-on phone to PC via Micro USB cable.
Install necessary driver.
Click "Unlock" button.
Follow software instructions (prompts).

Quote:

INFO : 10/16/2012 1:04:29 PM > To connect GT-I9100 phone you have to perform the following steps: INFO : 10/16/2012 1:04:29 PM > 1. Disconnect USB cable from phone. INFO : 10/16/2012 1:04:29 PM > 2. Go to Menu->Settings->Applications->Development. INFO : 10/16/2012 1:04:29 PM > 3. Turn on "USB Debugging" option. INFO : 10/16/2012 1:04:29 PM > 4. When message is appear press "Yes". INFO : 10/16/2012 1:04:29 PM > 5. Go to dial window. INFO : 10/16/2012 1:04:29 PM > 6. Enter "*#7284#" number. INFO : 10/16/2012 1:04:29 PM > 7. Set "USB" radio button to "PDA" value. INFO : 10/16/2012 1:04:29 PM > 8. Close window. INFO : 10/16/2012 1:04:29 PM > 9. Go to dial window. INFO : 10/16/2012 1:04:29 PM > 10. Enter "*#9090#" number. INFO : 10/16/2012 1:04:29 PM > 11. Set "Diag config" to "USB" value. INFO : 10/16/2012 1:04:29 PM > 12. Restart phone. INFO : 10/16/2012 1:04:29 PM > 13. Press "Read Info" in Octopus Samsung software. INFO : 10/16/2012 1:04:33 PM > Selected firmware file: GT-I9100_XXKG1_rooted.oct WARN : 10/16/2012 1:04:39 PM > Please switch your phone to the download mode and connect it to a PC. WARN : 10/16/2012 1:04:39 PM > To put GT-I9100 phone into download mode you have to perform the following steps: WARN : 10/16/2012 1:04:39 PM > 1. Reconnect phone battery. WARN : 10/16/2012 1:04:39 PM > 2. Press and hold "Volume - " + "Home" + "Power" buttons. WARN : 10/16/2012 1:04:39 PM > 3. When phone turns on press "Volume+" button. INFO : 10/16/2012 1:04:57 PM > Found phone on INFO : 10/16/2012 1:04:57 PM > Firmware write started. INFO : 10/16/2012 1:04:57 PM > Writing PIT section... INFO : 10/16/2012 1:05:02 PM > PIT section has been written successfully. INFO : 10/16/2012 1:05:02 PM > Writing FACTORYFS section... INFO : 10/16/2012 1:07:04 PM > FACTORYFS section has been written successfully. INFO : 10/16/2012 1:07:04 PM > Writing DATAFS section... INFO : 10/16/2012 1:07:15 PM > DATAFS section has been written successfully. INFO : 10/16/2012 1:07:15 PM > Writing CACHE section... INFO : 10/16/2012 1:07:18 PM > CACHE section has been written successfully. INFO : 10/16/2012 1:07:18 PM > Writing HIDDEN section... INFO : 10/16/2012 1:07:26 PM > HIDDEN section has been written successfully. INFO : 10/16/2012 1:07:26 PM > Writing PARAM section... INFO : 10/16/2012 1:07:28 PM > PARAM section has been written successfully. INFO : 10/16/2012 1:07:28 PM > Writing KERNEL section... INFO : 10/16/2012 1:07:31 PM > KERNEL section has been written successfully. INFO : 10/16/2012 1:07:31 PM > Writing BOOT section... INFO : 10/16/2012 1:07:33 PM > BOOT section has been written successfully. INFO : 10/16/2012 1:07:33 PM > Writing SBL1 section... INFO : 10/16/2012 1:07:36 PM > SBL1 section has been written successfully. INFO : 10/16/2012 1:07:36 PM > Writing MODEM section... INFO : 10/16/2012 1:07:40 PM > MODEM section has been written successfully. INFO : 10/16/2012 1:07:40 PM > Writing CACHE section... INFO : 10/16/2012 1:07:44 PM > CACHE section has been written successfully. INFO : 10/16/2012 1:07:45 PM > Firmware writing successfully completed. Unlocking: INFO : 10/16/2012 1:11:51 PM > Platform: Samsung Android INFO : 10/16/2012 1:11:51 PM > Selected port: COM186 INFO : 10/16/2012 1:11:51 PM > Selected model: GT-I9100 INFO : 10/16/2012 1:11:52 PM > Detected phone model: GT-I9100 INFO : 10/16/2012 1:11:52 PM > HW Version: SGH-I777ZKAATT INFO : 10/16/2012 1:11:52 PM > Phone IMEI: 358055-04-068410-4 INFO : 10/16/2012 1:11:52 PM > Firmware compiled date: Tue Jul 5 23:11:24 KST 2011 INFO : 10/16/2012 1:11:53 PM > Android version: 2.3.4 (GINGERBREAD) INFO : 10/16/2012 1:11:53 PM > Unlocking phone... INFO : 10/16/2012 1:11:54 PM > Creating NVM backup INFO : 10/16/2012 1:11:54 PM > Backup saved as C:\Program Files\GsmServer\OctopusSamsung\BACKUP\NVDATA-GT-I9100-358055040684104-16-10-2012_13-11-54-.nvm file INFO : 10/16/2012 1:11:54 PM > Unlocking phone. It can take some time. Please wait... INFO : 10/16/2012 1:11:59 PM > Phone will restart now INFO : 10/16/2012 1:11:59 PM > Phone is successfully unlocked INFO : 10/16/2012 1:11:59 PM > Phone will restart now

BR.