Here is successful unlock of K850:
Seking Unlocker(v2.21)
[ --- Query Credits --- ]
Connecting server(1)...
Connect to server(1) success!
User authen success!
Left Credits:27
Close connection success!
Connecting server(2)...
Connect to server(2) success!
User authen success!
Left Credits:27
Close connection success!
Time: 00min 06sec
[ --- EraseLock --- ]
Power off phone with battery,Press C key & plug DCU-60 in ...
Connect to phone success!
Baseband ID:C802
Protocol version:0401
EROM CID:52
OTP CID:52
OTP LOCK:1
IMEI:3******************xx7
Connecting server...
Connect Server Success!
User authen success!
Unlock request sent!
Credit need:8, credit left:27
Important notice:your requested data has been sent to server for calculation,erasing lock is not done currently,you should re-erase lock later until appearing erase lock success in message box.to do step 2 unlock will waste your credit if you don't get the message erasing lock success.erase lock only deducts credits at 1st time for the same phone.
Time: 00min 05sec
[ --- EraseLock --- ]
Power off phone with battery,Press C key & plug DCU-60 in ...
Connect to phone success!
Baseband ID:C802
Protocol version:0401
EROM CID:52
OTP CID:52
OTP LOCK:1
IMEI:3***************x7
Connecting server...
Connect Server Success!
User authen success!
Unlock request sent!
Save data success!
Initialize phone ,please wait...
Initialize Phone success!
Erasing lock...
Erasing lock success!
Time:00 min 30 sec
[ --- Start Unlock --- ]
Power on phone with battery,plug DCU-60 in ...
Found Sony Ericsson Device 117 USB WMC Data Modem(COM45)!
Open COM45 success(9600)!
IMEI:3******************5
Connecting server...
Connect Server Success!
User authen success!
Credit need:1, credit left:19
Unlock request sent, wait server process...
Don't terminate,your request is in queue,please wait...
Ready for unlocking,don't disconnect phone,please wait...
Authenticate 1 success!
Authenticate 2 success!
Authenticate 3 success!
Authenticate 4 success!
Authenticate 5 success!
Authenticate 6 success!
Authenticate 7 success!
Authenticate 8 success!
Unlock success!
Time: 01min 06sec