lumia 900 unlock error

[ahmertelecom]

Phone Type : Lumia 900 RM-808, RM-823
Unlock Type : Read PIN and PUK Unlock Codes
Other Notes : Automatic Counter Reset (If Needed)
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1. Make sure JTAG Connection is 100% OK
2. Always Disconnect the Phone BATTERY Flex Cable
3. Connect RJ-45 JTAG Cable to ATF Box
4. Connect USB Cable to Phone
5. Use RESET JTAG button to check the JTAG Connection
6. Click RESTORE BOOT button to Start Reading Unlock Codes
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Waiting for Device Connection 20 second(s)...OK
Resetting and Exploring JTAG chain...No Devices found in Chain!
Waiting for Device Connection 20 second(s)...OK
Resetting and Exploring JTAG chain...OK
Halting Core...Retry
Resetting and Exploring JTAG chain...OK
Halting Core...Retry
Resetting and Exploring JTAG chain...OK
Halting Core...Retry
Resetting and Exploring JTAG chain...OK
Halting Core...Cannot Halt Core!
Waiting for Device Connection 20 second(s)...OK
Resetting and Exploring JTAG chain...OK
Halting Core...Retry
Resetting and Exploring JTAG chain...OK
Halting Core...Retry
Resetting and Exploring JTAG chain...OK
Halting Core...Retry
Resetting and Exploring JTAG chain...OK
Halting Core...Cannot Halt Core! i sold wires properly i done many phone but this phone shows this error i recheck three times wires and resold but same error plz help rm-808 phone working perfect but only lock