check the cable or clean the connector
I just tested a k750 and it should work for you
Code:
Looking for the NEROkey...OK
Using reader: USB SMART CARD READER 0
Checking for card status...OK
Power OFF the phone, connect COM cable and press POWER short
Connected to COM15
Device identification...OK
Sending Preloader...OK
Starting GDFS service...OK
Chip:DB2010 Model:W800i IMEI:35655300728510 CID:36 Domain:BROWN
OTP LOCKED:1 CID:36 PAF:1
Uploading logic DB2010:
Shutting down device...OK
Selected current certificate: A1_DB2010_36_BROWN
Power OFF the phone, connect COM cable and press POWER short
Connected to COM15
Device identification...OK
Uploading logic DB2010:
Sending ResetLoader...OK
Authenticating with key KIDP96201233...OK
Reseting to factory defaults...OK
Shutting down device...OK
Power OFF the phone, connect COM cable and press POWER short
Connected to COM15
Device identification...OK
Uploading logic DB2010:
Sending ProductionLoader...OK
Writing EROM...OK
Recompiling security area...OK
Changing certificate to A1_DB2010_36_BROWN...OK
Shutting down device...OK
FINISHED [22sec]
please try the below modified steps
1. Putting out the telephone.
2. Withdrawing the battery.
3. Connecting the Cable SE K750i to the port USB of the PC. In the Divice Manager appears like:
UC-10 USB Composite Devive
CruiserTeam Universal Cable UC-10(COM9)
5. Executing Nero Team Studio
6. Select COM 9
7. Click in the button START
8. Connecting the Cable to the telephone
9. Connecting the battery (push it)
10. Power Shorts to the telephone
Best Regards