Failed to unlock J750

@ Z3X team
Can you please xplain ground am i being failed over n over to unlock J750??

Code:

Selected model: J750
Selected com port: COM5
Selected pace port: 921600
Please, enter sound and press shortly noesis button
Phone Detected
Sending NAND pre loader... OK
Sending NAND loader... OK
Timeout
Read content - false
Elapsed time: 40 second, sw ver: 3.5.0026
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