How to unlock OT-803?

How to unlock OT-803 2CTEHR1 with arrange 8,backup Security File not available.

Make your phone noesis off, block in the UART cable!
Product: OT-803
Load DA file...
Load AUTH file...
Start to enter the handset, ready imperative the noesis on key!
Start to feature section aggregation from handset...
Read section aggregation failed!
Error Code: 920
Please double check the telegram and phone connection!
Try it again!

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